how to pass selecteditem to another page ?

<?page title="new page title" contentType="text/html;charset=UTF-8"?>
<zk>
<window id="aolist" apply="com.loool.controleur.AOControleur" title="new page title" border="normal">
<button id="edit" image="/images/clipboard-24.png" tooltip="modifier" />

<listbox id="box" multiple="true" rows="5" model="@{aolist$composer.allAppelOffres}" 
		selectedItem="@{aolist$composer.current}">
		<listhead>
			<listheader label="numero" width="30%" />
			<listheader label="intitulé"  />
			<listheader label="objet" width="20%"/>
		</listhead>		
		<listitem self="@{each='event'}" value="@{event}">			
			<listcell label="@{event.num}"  value="@{eaolist$composer.current.num}" />
			<listcell label="@{event.intitule}"  value="@{aolist$composer.current.intitule}" />
			<listcell label="@{event.objet}"  value="@{aolist$composer.current.objet}"/>
		</listitem>
</listbox>

</window>
</zk>

public class AOControleur extends GenericForwardComposer {
	  
	    private static final long serialVersionUID = -9145887024839938515L;	    
	  
		ApplicationContext appContext = new ClassPathXmlApplicationContext("application-context.xml");
		IEntiteDao service = (IEntiteDao) appContext.getBean("hibernateNonIntrusiveHibernateDao");
		AppelOffre a = new AppelOffre();
		AppelOffre current = new AppelOffre();
		Grid aogrid;
		Grid aogridce;
		Listbox box;
		Button edit;
		
		public AppelOffre getCurrent() {
			return current;
		}
		public void setCurrent(AppelOffre current) {
			this.current = current;
		}

	    public List getAllAppelOffres() {	    	
	        return service.getAllEntites(a);
	    }
	 	    
	    public void onClick$edit() {
	    	System.out.println("==========="+current.getNum());
			((Include)edit.getDesktop().getPage("admin").getFellow("win").getFellow("tb").getFellow("include")).setSrc("EditAO.zul");

	    }
	 
	    
}

public class AOControleur extends GenericForwardComposer {
	  
	    private static final long serialVersionUID = -9145887024839938515L;	    
	  
		ApplicationContext appContext = new ClassPathXmlApplicationContext("application-context.xml");
		IEntiteDao service = (IEntiteDao) appContext.getBean("hibernateNonIntrusiveHibernateDao");
		AppelOffre a = new AppelOffre();
		Listbox box;
		Button edit;

               public List getAllAppelOffres() {	    	
	        return service.getAllEntites(a);
	       }
	 	public void onClick$edit() {
	                myWindow win = (myWindow)edit.getDesktop().getPage("admin").getFellow("win").getFellow("aolist"); 
			win.loadEditView();
	    }

public class myWindow extends Window{
	AppelOffre current = new AppelOffre();
	private Window editView; 
	
	public void setCurrent(AppelOffre current) {
		this.current = current;
	}
	public AppelOffre getCurrent() {
		return current;
	}
	public void loadEditView(){
		System.out.println("==========="+current.getNum());//that show null
	editView = (Window)Executions.createComponents("EditAO.zul",null, null);
	}
 
}

<window use="com.loool.controleur.myWindow" title="Modifier Appel d'offre"  style="text-align:left" width="80%" border="normal">
<grid>
		<columns>
			<column label="" width="20%"/>
		</columns>
		<rows>
			<row >
			<textbox value="@{myWindow.current.num}"  id="num" width="150px" tabbable="true" />
               </row>
		</rows>
	</grid>
</window>

<window use="com.loool.controleur.myWindow" id="aolist" apply="com.loool.controleur.AOControleur" title="new page title" border="normal">

<button id="edit" image="/images/clipboard-24.png" tooltip="modifier" />

<listbox id="box" multiple="true" rows="5" model="@{aolist$composer.allAppelOffres}" 
		selectedItem="@{myWindow.current}">
		<listhead>
			<listheader label="numero" width="30%" />
			<listheader label="intitulé"  />
			<listheader label="objet" width="20%"/>
		</listhead>		
		<listitem self="@{each='event'}" value="@{event}">			
			<listcell label="@{event.num}"  value="@{myWindow.current.num}" />
			<listcell label="@{event.intitule}"  value="@{myWindow.current.intitule}" />
			<listcell label="@{event.objet}"  value="@{myWindow.current.objet}"/>
		</listitem>
</listbox>


</window>