Bug 122283 [Smoke][Regression][SPM-Linux WS]Item in library can't be used when include library from library explorer
Details: Item in library can't be used when include library from library explorer Step: 1.New a library and Insert a label. 2.Open a report design 3.Open the library exploer in report and use the library 4.Drop the library label from library explorer into layout Actual results: Expection pop up. If use the library from report outline, label can drop in layout succeed.
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;
	}