Bug 136256 Enhance the message builder
Please see the spec attached in 133995 for detail.
UI/org.eclipse.birt.report.designer.ui.lib.explorer/src/org/eclipse/birt/report/designer/ui/lib/explorer/LibraryExplorerTreeViewPage.java
{
		ViewsTreeProvider provider = new ViewsTreeProvider( ) {
			public Image getImage( Object element )
			{
				if ( element instanceof LibraryHandle )
				{
					Image image = libraryProvider.getDisplayIcon( (LibraryHandle) element );
					if ( image == null )
					{
						image = ReportPlatformUIImages.getImage( element );
					}
					return image;
				}
				return super.getImage( element );
			}
		};
		treeViewer.setContentProvider( provider );
		treeViewer.setLabelProvider( provider );
		refreshRoot( );
		
		
		int ops = DND.DROP_COPY;
		Transfer[] transfers = new Transfer[]{
			TemplateTransfer.getInstance( )
		};
		treeViewer.addDragSupport( ops,
				transfers,
				new LibraryDragListener( treeViewer ) );
	}
	/**