Bug 122289 [Smoke][Regression][SPM-Linux WS]Item can't be dropped to layout from library
Details: Item can't be dropped to layout from library Setp: 1.New a library and insert a label 2.New a report design and use library 3.Drop label from library explorer to layout Actual results: Nothing is dropped into layout. Not only use library in outline, but also in library explorer is no effect. But when I drop the label without use library, it will use library and label can drop in it.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
/**
	 * Gets EditPartViewer in layout editor.
	 * 
	 * @return the EditPartViewer in layout editor, or null if not found.
	 */
	public static EditPartViewer getLayoutEditPartViewer( )
	{
		AbstractMultiPageLayoutEditor reportEditor = (AbstractMultiPageLayoutEditor) PlatformUI.getWorkbench( )
				.getActiveWorkbenchWindow( )
				.getActivePage( )
				.getActiveEditor( );
		if ( reportEditor == null
				|| !( reportEditor.getActiveEditor( ) instanceof GraphicalEditorWithFlyoutPalette ) )
		{
			return null;
		}
		return ( (GraphicalEditorWithFlyoutPalette) reportEditor.getActiveEditor( ) ).getGraphicalViewer( );
	}
	/**
	 * Creates a new grid layout without margins by default
	 * 
	 * @return the layout created
	 */
	public static GridLayout createGridLayoutWithoutMargin( )
	{
		GridLayout layout = new GridLayout( );
		layout.marginHeight = layout.marginWidth = 0;
		return layout;
	}
	/**