Bug 130495 Get rid of SessionHandleAdapter
Now, we use SessionHandleAdapter to keep current active report deisng. That's a bad practive for editor swith and rebuild will cuase lots of problmes. Need find way to replace it.
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/ui/editors/pages/ReportMasterPageEditorFormPage.java
IReportEditorPage
{
	public static final String ID = "BIRT.LayoutMasterPage"; 
	private FormEditor editor;
	private Control control;
	private int index;
	private ActivityStackListener commandStackListener = new ActivityStackListener( ) {
		public void stackChanged( ActivityStackEvent event )
		{
			updateStackActions( );
			editor.editorDirtyStateChanged( );
		}
	};
	
	private int staleType;
	protected void configureGraphicalViewer( )
	{