Bug 131484 Can't not add item by click the item from palette
Details: Can't not add item Setp: 1.New a report design and open the palette. 2.Click the lable icon. 3.Move the mouse to layout and click again to add the label. Actual result: Nothing is added in layout.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.forms.editor.FormEditor#dispose()
	 */
	public void dispose( )
	{
		getSite( ).getWorkbenchWindow( )
				.getPartService( )
				.removePartListener( this );
		DataSetManager.removeInstance( this.getEditorInput( ) );
		if ( fPalettePage != null )
		{
			fPalettePage.dispose( );
		}
		if ( outlinePage != null )
		{
			outlinePage.dispose( );
		}
		if ( dataPage != null )
		{
			dataPage.dispose( );
		}
		super.dispose( );
	}
	public IEditorPart getEditorPart( )
	{
		return this;
	}
}