Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
* 
	 */
	public boolean removeDisposeListener( IDisposeListener listener )
	{
		if ( disposeListeners == null )
			return false;
		return disposeListeners.remove( listener );
	}
	/**
	 * Broadcasts the dispose event to the dispose listeners.
	 * 
	 * @param event
	 *            the dispose event
	 */
	public void broadcastDisposeEvent( DisposeEvent event )
	{
		if ( disposeListeners != null )
		{
			Iterator iter = disposeListeners.iterator( );
			while ( iter.hasNext( ) )
			{
				IDisposeListener listener = (IDisposeListener) iter.next( );
				listener.moduleDisposed( (ModuleHandle) getHandle( this ),
						event );
			}
		}
	}
	/**
	 * Return a list of user-defined message keys. The list contained resource
	 * keys defined in the report itself and the keys defined in the referenced