Bug 154814 Use library, add library, delete library selection can't be found on Library right click menu in Library explorer
Details: Use library, add library, delete library selection can't be found on Library right click menu in Library explorer Step: 1.New a library and publish to resource folder. 2.New a report design and open library explorer. 3.Right click on the library in library explorer to use the library. Actual result: The selection of use, add ,delete library cannot be found. Exception result: Do can use the right click menu to use, add, delete library.
UI/org.eclipse.birt.report.designer.ui.lib.explorer/src/org/eclipse/birt/report/designer/ui/lib/explorer/LibraryExplorerTreeViewPage.java
catch ( BackingStoreException e )
		{
			ExceptionHandler.handle( e );
		}
	}
	/**
	 * Creates the context menu
	 */
	private void createContextMenus( )
	{
		MenuManager menuManager = new LibraryExplorerContextMenuProvider( this );
		Menu menu = menuManager.createContextMenu( treeViewer.getControl( ) );
		treeViewer.getControl( ).setMenu( menu );
		getSite( ).registerContextMenu( "#Pop up", menuManager, 
				getSite( ).getSelectionProvider( ) );
	}
	private String getTooltip( TreeItem item )
	{
		if ( item != null )
		{
			Object object = item.getData( );
			if ( object instanceof DataSourceHandle
					|| object instanceof DataSetHandle )
			{
				return Messages
						.getString( "LibraryExplorerTreeViewPage.toolTips.DragAndDropOutline" ); 
			}
			else if ( object instanceof ThemeHandle )
			{
				return Messages