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/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
.getPaletteViewer( ) != null )
				{
					GraphicalEditorWithFlyoutPalette editor = (GraphicalEditorWithFlyoutPalette) getActivePageInstance( );
					GraphicalViewer view = editor.getGraphicalViewer( );
					view.getEditDomain( ).loadDefaultTool( );
				}
			}
			return;
		}
		if ( part == this )
		{
			
			
			Display.getCurrent( ).asyncExec( new Runnable( ) {
				public void run( )
				{
					if ( getActivePageInstance( ) instanceof GraphicalEditorWithFlyoutPalette )
					{
						GraphicalEditorWithFlyoutPalette editor = (GraphicalEditorWithFlyoutPalette) getActivePageInstance( );
						GraphicalViewer view = editor.getGraphicalViewer( );
						UIUtil.resetViewSelection( view, true );
					}
				};
			} );
			if ( getEditorInput( ).exists( ) )
			{
				handleActivation( );
				SessionHandleAdapter.getInstance( )
						.setReportDesignHandle( getModel( ) );
				DataSetManager.initCurrentInstance( getEditorInput( ) );