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
super.configureGraphicalViewer( );
		WrapperCommandStack stack = (WrapperCommandStack) getCommandStack( );
		if ( stack != null )
		{
			stack.addCommandStackListener( getCommandStackListener( ) );
			staleType = IPageStaleType.MODEL_CHANGED;
		}
	}
	/**
	 * returns command stack listener.
	 */
	public ActivityStackListener getCommandStackListener( )
	{
		return commandStackListener;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.designer.ui.editors.IReportEditorPage#onBroughtToTop(org.eclipse.birt.report.designer.ui.editors.IReportEditorPage)
	 */
	public boolean onBroughtToTop( IReportEditorPage prePage )
	{
		if ( getEditorInput( ) != prePage.getEditorInput( ) )
		{
			setInput( prePage.getEditorInput( ) );
		}
		
		ModuleHandle model = SessionHandleAdapter.getInstance( ).getReportDesignHandle( );
		if ( model != null && getModel() != model)
		{		
			Object oldModel = getModel( );