	------------
ZK Spreadsheet 2.2.0
*Features:
   ZSS-01 Support validation dropdown list
   ZSS-13 Support Open hyperlink in a separate browser tab window
   ZSS-26 Need css running in zk.wcs not css.dsp
   ZSS-41 Support showing more charts: area, stacked area, scatter, bubble, stacked bar, stacked bar3d in 2007 file format(.xlsx)
   ZSS-44 Support API to add a new chart in 2007 file format(.xlsx)
   ZSS-45 Support API to add a new picture in 2007 file format(.xlsx)
   ZSS-46 Support API to delete an existing picture in 2007 file format(.xlsx)
   ZSS-47 Support API to move an existing picture in 2007 file format(.xlsx)
   ZSS-48 Support API to move an existing chart in 2007 file format(.xlsx)
   ZSS-49 ZSS Spreadsheet App shall support insert chart dynamically
   ZSS-50 ZSS Spreadsheet App shall support insert image dynamically
   ZSS-51 Support API to delete an existing chart in 2007 file format(.xlsx)
   ZSS-54 Chart/Image widget shall be able to move, sizing and delete
   ZSS-55 Auto filter dialog support search function
   ZSS-58 Support collaboration editing with color cell selection focus box
   ZSS-59 Formula editor support cancel button and apply button
   ZSS-60 Editing formula support use mouse to select a cell or a selection
   ZSS-62 ZPOI upgrade to POI 3.8 beta5
   ZSS-64 ZK Spreadsheet App shall support sheet deletion collaboration
   ZSS-66 POI row object should provide information about the height is changed by end user or not
   ZSS-67 Support locale aware Date and Number input 
   ZSS-68 Support showing Date and Number with current locale 
   ZSS-69 Support locale aware drag fill for Month and Week 

*Bug
   ZSS-15 edit date cells doesn't work
   ZSS-20 Incorrect PDF export results if merged cell span across page breaks
   ZSS-21 Right click on hyperlink should not jump to the link
   ZSS-22 Shall not allow Copy and Paste operation in a protected spreadsheet
   ZSS-24 key on numpad is not work on Opera
   ZSS-27 Wrap text does not change row height to make all content visible
   ZSS-29 Formula editor cursor not correctly positioned in different browser when focus changed when composing formula
   ZSS-40 Press Ctrl+V for long time does not work correctly
   ZSS-42 Export PDF, merged cell's border doesn't show up correctly
   ZSS-43 Export PDF, sheet break, contains empty page
   ZSS-52 Past special, copy column width's behavior doesn't correct
   ZSS-56 Unlock a cell, protect sheet, cannot double click to edit the cell
   ZSS-61 setSrc doesn't work on a empty spreadsheet
   ZSS-65 When cell wrap, cell shall hide overflow text
   ZSS-70 scroll down with freeze column, in freeze area, some row is empty
   ZSS-71 Use preloadRowSize width column freeze, when scroll down very fast and multiple times in short time, doesn't work well
   ZSS-72 Set one column freeze, and set preloadColumnSize, cause JS error
   ZSS-73 Scroll down and scroll right, then scroll top, cause empty area
   ZSS-74 Set maxcolumns 20 cause JS error
   ZSS-75 Set book null, cause NPE
   ZSS-76 Set data format cause NPE in US locale
   ZSS-77 Drag fill "Jan" on new sheet, cause NPE
   ZSS-78 Implementation of RangeImpl#setValue() is not correct
   ZSS-79 zss JSF component cause JS error
   
* Upgrade Notes
  + Per the feature ZSS-13, Spreadsheet will always open hyperlink in a separate browser tab window. 
    If you need to keep the original behavior (click to open hyperlink in the same browser tab window; 
	CTRL-click to open hyperlink in a separate browser tab window), please specify in zk.xml the 
	following library property to false:
	<library-property>
		<name>org.zkoss.zss.ui.Spreadsheet.linkToNewTab</name>
		<value>false</value>
	</library-property>
	
	------------
ZK Spreadsheet 2.1.1
*Features:

*Bug
   ZSS-25 Cell with hyperlink in Firefox got redundant line
   ZSS-28 Spreadsheet data binding does not work
   ZSS-31 NullPointerException in some application server. ex Domino
   ZSS-32 xls file set cell style cause exception
   ZSS-33 Nullpointer when change the color of cell
   ZSS-34 cell background color does not show in excel
   ZSS-35 A exported xlsx is not loadable again by Excel or Spreadsheet
   ZSS-36 Exception when exporting excel twice
   ZSS-37 A timer doesn't cleanup, cause tomcat cannot stop
   ZSS-39 Hide row on IE7 will popup javascript error message
   
	------------
ZK Spreadsheet 2.1.0

*Features:
   26 Support copy/paste value to local Excel
  161 Support copy&paste from clipboard to a cell
  238 ZK Spreadsheet App: Support select cell reference for formula entrance
  293 Support AutoFilter in 2007 file format(.xlsx)
  294 Support 2003, 2007 Excel file format export to HTML
  309 Support vertical merge
  310 Autofill support number auto linear increase
  312 Autofill support month/week auto increase
  314 Autofill support date auto increase
  316 Autofill support number auto growth(multiply increase)
  319 Support cell vertical alignment
  323 Protecting cells/cell ranges
  330 Support Range#applyFilter for 2007 file format(.xlsx)
  331 Support Range#showAllData for 2007 file format(.xlsx)

*Bug 
  290 Formula cells not always updated
  296 Can't insert formula "=A1" by java
  297 cell color is not right in xls file
  298 input/output/format of number-cells doesn't respect current locale
  300 Numbers in Text-cells are not treated as text (leading zero is removed)
  303 Spreadsheet Mask not removed when set visible of the container
  304 Resizing guiding line does not show
  305 ZK Spreadsheet App: Formula bar text box is not left aligned to just right of f(x) button
  307 chart not shown when set visible of the container of the spreadsheet
  308 Set empty String to cell shall be deemed as blank cell
  311 =20.6+3.6 formula shows incorrect number
  313 Typemismatch exception when Copy formula onto a Text cell
  315 freezed pane rows/columns don t work when setting Spreadsheet from Composer.  
  317 Number 0 shall be date 1900/1/0 0:00 (Java Date 1899/12/31 0:00)
  318 xlsx only. IllegalArgumentException when formula cause a circular reference
  320 NullPointerException when move cell focus
  322 CellStyle.getLocked() always return false in 2007(xlsx) file format.
  324 Spreadsheet wrap text doesn't work
  325 Spreadsheet unwrap text doesn't work
  326 Sizing row height the associated Merged area should sizing accordingly
  328 ZK Spreadsheet App throw ComponentNotFoundException when press "hyperlink" button
  329 Move Focus on hidden row/column, the row/column header highlight is not correct
  332 Scroll sheet down and up cause javascript error
  333 Merged cell with auto filter has more one filter button
  334 AutoFilter cause exception
  336 Showing incorrect contents when press filter drop button in merge cell 
  337 Filter dropdown button incorrectly change to "filter icon" after click the dropdown button and press OK.
  338 Reapply filter fail to work
  339 "=" + mouse click to input formula
  340 Spreadsheet hyperlink font underline in wrong position
  341 ZK Spreadsheet App: open custom sort range twice, UI doesn't work well
  342 ZK Spreadsheet App: use compose formula dialog, when focus one last textbox, focus will change to first textbox
  343 ZK Spreadsheet App: insert image cause class cast exception
  344 ZK Spreadsheet App: after close sheet should not able to click save sheet menu
  345 ZK Spreadsheet App: select a column and apply number format, cause server no response
  346 ZK Spreadsheet App: compose formula dialog input formula to wrong cell
  347 Wrong page orientation for PDF export in Portrait mode
  348 Formula cell formatting lost in PDF export file
  
  
	------------
ZK Spreadsheet 2.0.1

*Features:
  169 xls file support full rgb color
  277 ZK Spreadsheet App: Formula Editor shall support multiple line and extensible
  281 Support wrapping of ZK Spreadsheet as a JSP tag
  278 ZK Spreadsheet App: press ESC shall close(cancel) any wizards/dialogs
  
*Bug 
  268 Enter multiple line in cell but show as one single line only
  269 ZK Spreadsheet App: multiple line in cell but single line in formula bar
  270 Set font style with a cell has white color cause NPL
  271 ZK Spreadsheet App: NPE when focus on formulabar editor with a no book Spreadsheet
  272 ZK Spreadsheet App: NPE when close the book
  273 ZK Spreadsheet App: Shall disable formula bar, insert menu items when there is no book
  274 Rename sheet with a chart inside and export to excel, chart is missing
  275 Rename sheet with a chart and switch sheets cause NPE
  276 ZK Spreadsheet App: Selection shall move to left when shift-Tab on Formula bar editor
  279 ZK Spreadsheet App: a error dialog in compose formula dialog
  280 ZK Spreadsheet App: NPE in compose SUM formula dialog
  282 After "export to Excel", cause XmlValueDisconnectedException
  283 set spreadsheet visible="false" cause error dialog
  284 ZK Spreadsheet App: after delete a sheet, the horizontal scrollbar will disappear
  285 Spreadsheet component with Liferay, on Chrome and IE, Layout is wrong
  286 NPE when load the attached xls file
  287 click on specific cell and set font bold, cause NPE
  288 ZK Spreadsheet App: number format dialog select "General" cause error dialog
  289 xls font color does not match to what was in Excel
  
	------------
ZK Spreadsheet 2.0.0

*Features:
  46  Support showing chart(Bar, Bar3D, Line, Line3D, Pie, Pie3D, Donut, Excel 97-2003, xls)
  134 Support Math formula functions for Matrix operations
  135 Support Math formula functions
  136 Support Statistical formula function for calculating distribution
  137 Support Statistical formula functions for calculating mean
  138 Support Text formula functions
  140 Support Information formula functions
  141 Support showing chart(Bar, Bar3D, Line, Line3D, Pie, Pie3D, Donut, Excel 2007, xlsx)
  142 Support for Date & Time functions
  143 Support for Logical formula functions
  145 Support select range by shift key
  152 Support Ranges.range(sheet, namedRange)
  158 ZK Spreadsheet App support colorbutton without depending zkex
  160 ZK Spreadsheet App support import, open file
  165 Support 2007 Excel file format export to PDF
  192 Support exporting Excel Chart to PDF
  194 ZK Spreadsheet App support shift cell, entire row or column
  199 ZK Spreadsheet App shall support wrap text.
  212 Cannot shift select left on merge cell
  222 ZK Spreadsheet App shall support number format
  234 Support export to xls and xlsx
  246 ZK Spreadsheet App support save file
  247 ZK Spreadsheet App editor shall support tab and cancel key control
  251 ZK Spreadsheet App support set column width and row height
  
*Bug 
  132 view ZK Spreadsheet App index.zul cause NullPointerException
  139 "Unexpected ptg class" RuntimeException when loading Excel file with special formula
  144 copy from a cell to a range
  146 selected range should stay emphasised when click menubutton
  148 Can't delete row in the bottom
  149 change size of multi-column
  150 change size of multi-row
  153 column header is not aligned when resize a freezed column
  154 border not well in all borders, inside borders, inside horizontal borders, inside vertical borders
  155 source region of copy get highlighted in different sheet
  156 spring DelegatingVariableResolver in Spreadsheet doesn't work
  157 fail to delete rows out of original xlsx
  163 Can't set backgrond color to excel 2007 file format
  164 no grid line while export to pdf
  166 ZK Spreadsheet App, Modify the font size, cell height won't automatically adjust
  167 set background color seems like multiple selection in color choosing
  168 Exception while set background color
  170 Set font color of a region with different font size, will resize the font size.
  171 Once clicked, merge button remain pressed state
  172 paste transpose error
  180 ZK Spreadsheet App support hide column/row function
  182 Exception when right click row header and insert a row
  187 Select and focus shall not move when insert/delete columns/rows/cells
  188 NullPointerException when delete columns
  189 Cell formula is not properly shifted when delete rows
  190 Selection is not correctly placed after paste.
  191 Shall return #NAME? when entering a random named function
  193 Throw exception when open a sheet with random named function
  195 Exception when not specified src or book to <spreadsheet>
  196 Range fill down, fill left, fill right, fill up doesn't work
  197 Text color does not respect condition format
  198 Shall be interpret as hyperlink if user enter "http://" into cell
  200 Exception in paste special from context menu
  201 Cell Background Color is not correctly shown in Excel 2007 xlsx
  202 Enter key after copy/cut does not do "paste"
  203 ESC key after copy/cut does not cancel the copy/cut.
  204 ZK Spreadsheet App gridline checkbox is not updated when change sheet
  205 Copy and paste does not copy a merge cell
  206 Cell editing after copy/cut does not cancel copy/cut.
  207 ZK Spreadsheet App focus on formula edit box after copy/cut does not cancel copy/cut
  208 Spreadsheet focus position is lost onBlur
  210 Bug in spreadsheet date-time display
  211 Shift + arrow key selection does not respect merge cell.
  213 ZK Spreadsheet App compalins "Not unique in ID space <Window mainWin>: formulaWin"
  215 ZK Spreadsheet App View->Formula Bar complains "Fellow component not found: formatNumberWin"
  217 ZK Spreadsheet App delete sheet not working
  219 ZK Spreadsheet App rename Sheet, current tab move to 1st sheet tab
  220 ZK Spreadsheet App Formula function selection dialog title is not correct
  221 ZK Spreadsheet App NPE if leave Insert Function Dialog without select an item
  223 Insert/delete row/column to book shall NOT affect maxrows and maxcolumns of the Spreadsheet
  224 Select a range to delete but only left-top cell removed
  225 Exception when remove a row which is referenced by a cell
  226 Exception when change sheet quickly
  227 ZK Spreadsheet App set display gridline doesn't work on IE
  228 In IE, press F2, won't focus on cell for input value
  230 IE cursor position is not at the text end when press F2
  231 Absolute Cell Reference shall not move when copy, paste
  232 NPE when load the attached xlsx file
  233 Right click header selection doesn't work well
  235 Transpose pasteSpecial shall reverse Row/Column formula reference
  236 Delete current sheet and set selected sheet cause exception when use xlsx as source
  239 Bad error code(-60)
  240 Irrelevant merged regions faultly unmerged when delete a cell and shift left
  241 Shall complains about an incorrect formula
  242 Delete key not working when edit cell
  244 ZK Spreadsheet App: formula bar cursor will unexpectedly move to the end of the text
  248 ZK Spreadsheet App: Tab on formula editor if focus on the last visible column, shall not move focus right
  249 ZK Spreadsheet App: Enter on formula editor if focus on the last visible row, shall not move focus down
  252 ZK Spreadsheet App: Click on formula bar editor, the spreadsheet Cell did not change to formula accordingly
  253 ZK Spreadsheet App: Cell wrongly set to incorrect value
  254 Illegal highlight exception when copy and switch sheet
  255 ZK Spreadsheet App: change sheet lost the focus
  256 ZK Spreadsheet App: A Currency number format does not match expected
  257 Style is wrongly copied when insert a row
  258 ZK Spreadsheet App insert whole row/column cause set selection out of range exception
  261 ZK Spreadsheet App: click a cell and set border, cause NPE
  262 ZK Spreadsheet App: unwanted error dialog when sort
  264 ZK Spreadsheet App: Cut should has no memory of area after once copied
  266 ZK Spreadsheet App: Toolbar button Grid line easily unsync
  267 ZK Spreadsheet App: cut & paste column takes too long
  
* Upgrade Notes
  + Package names of classes in zpoi.jar are renamed from org.apache.poi.* to org.zkoss.poi.* to avoid class 
    name conflicts with of those in poi.jar, so it is now OK to put both zpoi.jar and poi.jar in class path.
  + Spec. of Range#getColumn(), Range#getRow(), Range#getLastColumn(), Range#getLastRow(), Range#getCells() has 
    changed from 1-based to 0-based so it consists with other APIs. That is, in new spec, Range#getColumn() 
	return 0 for column A (1st column) and Range#getRow() return 0 for row 1 (1st row).
  + Spreadsheet#getSelectedSheet() return org.zkoss.zss.model.Worksheet
  + Methods range(org.apache.poi.ss.usermodel.Sheet sheet, ...) in org.zkoss.zss.model.Ranges changed signature 
    to range(org.zkoss.zss.model.Worksheet sheet, ...)
	
	------------
ZK Spreadsheet 2.0.0 RC

*Features:
  65 Honer displayGridlines parameter   	 
  70 Support insert rows(Excel 2007, xlsx)
  71 Support delete rows(Excel 2007, xlsx) 
  74 Support insert columns(Excel 2007, xlsx)
  75 Support delete columns(Excel 2007, xlsx)
  76 ZK Spreadsheet App support set font by toolbarbutton and menu
  77 ZK Spreadsheet App support set font size menu and toolbarbutton
  78 ZK Spreadsheet App support set color to cell and font by menu and toolbarbutton
  79 ZK Spreadsheet App support set font bold by menu and toolbarbutton
  80 ZK Spreadsheet App support set font italic by menu and toolbarbutton
  81 ZK Spreadsheet App support set font underline by menu and toolbarbutton
  82 ZK Spreadsheet App support set font strike by menu and toolbarbutton
  83 ZK Spreadsheet App support set cell alignment by menu and toolbarbutton
  84 ZK Spreadsheet App support clear cell style by menu
  85 Support insertRange(Excel 2007, xlsx)   	 
  86 Support deleteRange(Excel 2007, xlsx)
  88 Support moveRange(Excel 2007, xlsx)   	 
  89 Support merge(Excel 2007, xlsx) 
  95 Support for ACCRINT financial funcion
  96 Support for ACCRINTM financial funcion
  100 Support COUPON financial functions
  101 Support DISC financial function
  102 Support DOLLAR conversion financial function
  105 Support DURATION financial function
  107 ZK Spreadsheet App support export PDF
  108 Support showing pictures(Excel 2007, xlsx)
  111 Support exporting selected sheet to pdf
  112 Support exporting selected area to pdf
  113 Support annual interest rate financial functions EFFECT and NOMINAL
  114 Support security related financial function
  115 Support yield related financial function
  116 Support Treasury Bill related financial functions
  120 ZK Spreadsheet App support set hyperlink menu and toolbarbutton
  121 Support Binary number conversion engineering functions
  122 Support Decimal number conversion engineering functions
  123 Support Hexadecimal number conversion engineering functions
  124 Support octal number conversion engineering functions
  126 Support Bessel engineering functions
  127 Support DELTA ERF ERFC and GESTEP engineering functions
  128 Support complex number engineering functions
  129 Support input mask for entering Date or Time into cell.
  130 ZK Spreadsheet App Support display, hide gridlines
  131 Support wrapping ZK Spreadsheet as a JSF Ajax Component

*Bug
  44 Locale is not respected
  61 Fronzen row/column does not comply with Spreadsheet's maxrows/maxcolumn
  64 pasteSpecial copy Validation cause Null pointer exception (Ptgs must not be null) 
  66 Unexpected gridlines shown 
  67 Exception when enter value 0.3308589607635 into cell with text format "# ???/???"
  68 Exception when set text format to ?/2, ?/4, ?/8, ?/16, ??/100
  69 Incorrect text output when enter value 0 into cell with text format "???/???"
  72 IE6 rendering issue - fixed column & row sizes/positions 
  73 Edit on the shorter last visible row cause the grid moving up
  87 =HYPERLINK() function in Excel 2007xlsx not follow as a hyperlink
  91 NPE when load cell with color style(Excel 2007, xlsx)
  93 NPE when load sheet with merge cell
  97 StringIndexOutOfBoundsException if cell text format is _(*"_"??_) 
  98 Freeze area is not rendered if it is on the second sheet
  99 freeze column and freeze row is not reset.
  103 Freeze row/column is not correctly interpreted
  106 NPE when load Excel 2007 file with rich text string
  109 2nd picuture is not shown.
  110 merge area is not reset
  117 Barcode Scanner data incomplete
  119 Typing in 234-6 or 344/2 into cell cause junk number value
  
	------------
ZK Spreadsheet 2.0.0 beta3

*Features:
  36 Support Range.setStyle
  37 Support Range.autoFill
  38 Support Range.clearContent
  40 Support Range.fillUp
  41 Support Range.fillDown
  42 Support Range.fillRight
  43 Support Range.fillLeft
  48 Honer hidden columns	 
  49 Honer hidden rows	 
  50 Support drag to hide column	 
  51 Support drag to hide row	 
  52 Support drag to sizing so un-hide a hidden column	 
  53 Support drag to sizing so un-hide a hidden row	 
  28 Support hideRows
  29 Support unhideRows
  30 Support hideColumns
  31 Support unhideColumns
  55 Support Range.setHidden
  57 ZK Spreadsheet App support sort/custom sort menu and toolbarbutton
  62 Support getRepeatingRowsAndColumns
  58 Support printing ZK Spreadsheet to PDF file
  63 ZK Spreadsheet App support copy/paste/pastSpecial menu and toolbarbutton

*Bug
  56 zss error in log   
  47 zss2 beta 2 IE support
  54 data input errors - lost characters when switching to edit mode
  60 Sort function when select multiple columns cause Nullpointer exception
  59 Sort with case sensitive should be in special spreadsheet order

	------------
ZK Spreadsheet 2.0.0 beta2

*Features:
  6 Support insert rows(Excel 97-2003, xls)
  7 Support delete rows(Excel 97-2003, xls)
  9 Support insert columns(Excel 97-2003, xls)
  10 Support delete columns(Excel 97-2003, xls)
  12 Support sortByColumns
  13 Support sortByRows
  15 Support insertRange(Excel 97-2003, xls)
  16 Support deleteRange(Excel 97-2003, xls)
  17 Support moveRange
  18 Support merge
  19 Support showing bullet list in cell
  20 Support unMerge
  21 Support setBorders
  22 Support setColumnWidth
  23 Support setRowHeight
  25 Support pasteSpecial
  27 Support Hyperlink follow up.
  
*Bug
  11 NPE when click on an empty cell
  14 Picture is not correctly shown(ZK Spreadsheet EE)
  24 Drag selecting an area shall snap to the boundary of merged cells
  32 Wrong height when insert rows
  33 Wrong width when insert columns 
  34 moveRange fail to shift formula correctly
  35 Hyperlink should show the formated text
  
	------------
ZK Spreadsheet 2.0.0 beta (Work with ZK 5 and after)

* Features:
  1 Support ZK 5
  2 Support importing Excel 2007 xlsx file
  3 Showing rich text
  4 Efficient formula dependency tracking
  5 Consistent column width on the browser and Excel application
	
* Upgrade Notes:
  + Ported to work with ZK 5
  + The backend data model and formula evaluation engine is completly _REWRITTEN_
    to be based on Apache POI library(Java API To Access Microsoft Excel Format 
	Files) such that we can support more features. The consequence are most classes 
	and APIs that were in org.zkoss.zss.model of version 1.x are no longer existed.
  + Spreadsheet remove deprecated method setUrl and getUrl. Use setSrc and getSrc 
    instead
  + Spreadsheet remove deprecated method setMaxrow and getMaxrow. Use getMaxrows and
    setMaxrows instead
  + Spreadsheet remove deprecated method setMaxcolumn and getMaxcolumn. Use 
    getMaxcolumns and setMaxcolumns instead
  
	------------
ZK Spreadsheet 1.0.0 RC1 (Work with ZK 3 and before)

Feature:
  1984354 Support fire size change event after set column/row size
  1984356 UI Support handle column/row size change event.
  1989663 Support showing a highlight area 
  1990401 Change setColumnnames to setColumntitles
  1990704 Support tab key to control move right and left
  1991532 Supports client can start editing by press on keys
  1990542 UI support format change event
  1995825 Modify css(.zk) to compete future version of ZK
  2001369 Provide auto adapting FunctionMap of Page to Book
  2001613 A way to enlarge the editing box
  
Bug:
  1986288 Head override scroll bar in some firefox/IE
  1989337 Merged cell error after insert/remove a row
  1989815 Selection out of sync if move cell focus by key
  1989384 insertColumns(-1,-1) bug
  1989379 insertColumns doesn't update UI correctly
  1990632 Border doesn't accrod with background color
  1989384 insertColumns(-1,-1) bug
  1991614 ExcelImporter fail to import Text Format
  1985247 Cell with date format cause exception
  1988691 Number format won't be imported correctly
  1990408 Set row height small than 5 will be broken in IE
  1992587 Style doens't be copied after insert
  1992704 setRowHeight out of boundary add extra space
  1992843 zsw,zsh information doesn't load correctly on header
  1992679 Insert rows in freeze panes doesn't work
  1991498 setFontColor() in Format doesn't work
  1994864 Drag on highlihgt area border cause selection moving
  1994997 onCellSelection has wrong value when click on a merge cell
  1995031 focusTo() doesn't work if doesn't invoke in AU
  1995734 To many custom row height
  1997415 Accounting format has wrong display when value is empty
  1997417 Too large update range in SSData content change event
  1995691 Highlight doesn't showup after invalidate
  2000569 Selection change should fire after mouse up
  2000567 Right click on selected header should not change selection
  2000537 onCellClick should not be fired when mouseup on another cell
  1995689 selection rectangle error when listen onCellClick
  1995735 IE:text doesn't overflow if column width small then 4
  1989680 setColumnWidth Bug
  1991731 SUM(A3:A1) won't be calculated
  2002276 Wrong image widget size
  
* Upgrade Notes
  + setColumnnames/setRownames/getColumnnames/getRownames of UI Spreadsheet were removed, use  
    setColumntitles/setRowtitles/getColumntitles/getRowtitles instead.  
  
  --------
ZK Spreadsheet 1.0.0 beta3

Feature:
  1960727 Support selection of row and column
  1960733 Support selection when mouse dragging on cells
  1963549 Support move and modify the selection range
  1964452 Support selection by key
  1965003 Select all when mouse down on left-top corner
  1970131 Sheet support delete rows, columns, range
  1970128 Sheet support insert rows, columns, range
  1977477 setMaxrow/column support smartUpdate
  1981665 Change setMaxrow to setMaxrows, also at columm
  1981776 Model:Support MERGE events when call merge/unmerge cell
  1977531 UI Support Row/Column Insert/Delete Event of Model    
  1977528 UI Support Merge Event of Model
  1984094 Provide API to get last focus and selection of spreadsheet
  1985245 Change setUrl to setSrc of Spreadsheet
  1985320 Get custom column widths/custom row heights
  
Bug:
  1964249 Move/modify selection doesn't work in freeze row/col mode
  1964255 Reselection in selected range doesn't work in freeze mode
  1965001 The method copyCell only copy values without its format
  1970238 Always show freeze panel when import a empty xls
  1974069 onCellClick Event doesn't be fired.
  1977301 Exception when invoke insertColumn
  1973837 MODEL:Col/Row size doen't be shifted after inserts
  1978676 Model exception when remove/insert a column/row
  1978860 When delete a column/row,no need to send CONTENTS_CHANGE
  1979032 zss css not applied in zssdemo, IE only
  1978933 Exception when delete a row which contains a merge cell 
  1981657 Load extra 1 cell to client side
  1981771 Call unmergeCells twice throws exception
  1982844 Wrong MERGE_CHANGE data when inert column
  1982915 Wrong cell style when CONTENTS_CHANGE event
  1983346 IE : Cell doesn't align after unmerge a long text cell
  1983343 minus number in formula cause exception
  1984095 Selection changed when focus back.
  1984108 focus and selection lost after invalidate()
  1984106 Formula should change when ref cell moved
  1984262 Refer to an empty cell should return 0 not "empty"
  1984347 Destination reference should be delete and cause #REF!
  1985264 Column/row size back to default after invalidate
  1986025 Custom width is not correctly imported
  
* Upgrade Notes
  + setMaxrow/getMaxrow/setMaxcolumn/getMaxcolumn of UI Spreadsheet were deprecated, use  
    setMaxrows/getMaxrows/setMaxcolumns/getMaxcolumns instead.
  +	setUrl/getUrl of UI Spreadsheet were deprecated, use setSrc/getSrc instead.
  
  --------
ZK Spreadsheet 1.0.0 beta2

Feature:
  1941769 Support notify cell update via variable names
  1941909 Support cell editing control event
  1941790 Support Key Event on Spreadsheet
  1950246 Support another way to stop editing event.
  1950247 Support a way to intercept default startEditing value
  1953243 Support initial mask
  1950481 Support displaying Image in Spreadsheet
  1953297 Support retrieve spreadsheet focus
  
Bug:
  1939913 var name loss when import an unknown variable in formula
  1939916 importer throws Unrecognized Function if use unknown func
  1942569 The last 'n' character disapper in formula
  1943565 Bug in notifyChange(String[])
  1943547 The external functions can't be imported
  1950469 Add 2 widgets cause client side error
  1950483 Worng attr value if I set attr after add image widget
  1951423 IE : row is broken when scroll down
  1953236 Cell doesn't be loaded after scrolling
  1953126 command should be delay when spreadsheet is invalidate
  1953830 Unnecessary command was sent and break the processing
  1954061 setWidth setHeight doesn't work
  
  --------
ZK Spreadsheet 1.0.0 beta

Feature:
  1892469 Supports multi-line inline editing
  1871760 Provdes cell style in UI, such as font and border
  1912497 Load Header by demand in UI.
  1907728 Support ErrorCell
  1917924 Support Named Ranges
  1917937 Support Range Operator
  1917938 Support Range Union Operator
  1917941 Support Range Intersect operation
  1906207 Require row index and column index of input array
  1919284 Support constant array formula
  1871755 Provides horizontal cell merging in UI
  1931942 Support resolve a.b.c varible expression
  1930766 Supports Hide Row and Column Header
  1871756 Provides Forzen Panel in UI
  
Bug:
  1891619 Cann't use character ">","<","""
  1906208 Empty String should be deemed as 0d
  1906711 Border didn't show up correctly in Browser
  1902921 Merged cell - validateCorner
  1883293 SSDataEvent not fired when using simple formula
  1906763 Wrong focus mark when change default cell width and height
  1906197 Number of params is not consistent with excel function
  1908659 Cell with format & refer to other cell throws exeception
  1907786 NullPointerException when getTextColor() is invoked
  1908634 Negative Percentage Bug
  1908699 Rounding Bug
  1909323 Space character is skiped in client side
  1909371 Rounding Error
  1907709 Cross reference Refers to Wrong Sheet at Init
  1913313 Reference to an inexisting sheet should return #REF!
  1916449 Cell fill in an error e.g. #DIV/0! should be an Error object
  1916490 A way allows spreadsheet functions to handle "#REF!"
  1917727 Can not view empty sheet
  1932034 Named Range Dependency Issue
  1933107 Cell refer to a Range show Range.toString()
  1919118 Cell display time format at first time editing.
  1933186 Range.getCellsArray() throws IndexOutOfBoundException
  
  --------
ZK Spreadsheet 0.7.0
(ZK Spreadsheet project move to https://sourceforge.net/projects/zss/ after 0.6.0)

Feature:
  1869091 Model support Image
  1871754 Provide text overflow when text is too long in cells
  1871758 Provides Text wrapping in UI
  1871759 Load Cell by demand in UI.
  1883400 The size of column and row can set to zero in UI
  1883403 Supports highlight column and row header of selection range.
  
Bug:
  1882263 Cell.getText() throw exception when has formula.
  1885998 Error when moving focus to a cell which column width is 0
  1886002 Top Head will disappear when scrolling to right most in Opera
  1886003 Cell doesn't be load when I small a column or row

  --------
ZK Spreadsheet 0.6.0

Feature:
  1858877 Sheet support mergeCells and unmergeCells
  1855751 Provide customization of column and row's header name
  1859510 Sheet support getMergeRangs
  1859511 Sheet support defaultColumnWidth, defalutRowHeight
  1859512 Sheet support columnWidth and rowHeight
  1861271 Sheet support columnFreeze and rowFreeze
  
Bug:
  1855748 EmptyStackException when type "=" in cell
  1855750 FormulaListener not work if change the formula value
  1861948 [ZSS] NullPointerException - getMergeRanges()
  
  --------
ZK Spreadsheet 0.2.0
* Support Spread Sheet UI (1st draft)
* Support in-place-edit, top header, left header, scroll in view, selector mark, focus

  --------
ZK Spreadsheet 0.1.0
* Support Spread Sheet model (1st draft)
* Support SUM function
* Support Spread Sheet engine (1st draft)
* Formula parser
* Formula evaluator
* Excel Importer (without format)
  