DesktopCleanup (zk 10.0.0-Beta API)

```
public interface DesktopCleanup
```
Used to clean up a desktop.
There are two ways to use this interface.
First: add the listener at the run time

Call Desktop.addListener(java.lang.Object) to register it.
Second: use configuration
1. Specify a class that implements this interface in WEB-INF/zk.xml as a listener.
2. Then, each time ZK loader is destroying a desktop, an instance of the specified class is instantiated and cleanup(org.zkoss.zk.ui.Desktop) is called.
Author:

tomyeh

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void cleanup(Desktop desktop)
  called when a desktop is about to be destroyed.

- Method Detail
  - cleanup
```
void cleanup(Desktop desktop)
      throws java.lang.Exception
```
    called when a desktop is about to be destroyed.
    If this method throws an exception, the error message is only logged (user won't see it).
    
    Throws:
    
    java.lang.Exception