Bug 210609 [Smoke]Crosstab is failed to preview in runtime
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/extension/ExtendedEditPart.java
public void performDirectEdit( )
	{
		IReportItemBuilderUI builder = ExtensionPointManager.getInstance( )
				.getExtendedElementPoint( ( (ExtendedItemHandle) getModel( ) ).getExtensionName( ) )
				.getReportItemBuilderUI( );
		if ( builder != null )
		{
			
			CommandStack stack = SessionHandleAdapter.getInstance( )
					.getCommandStack( );
			final String transName = Messages.getFormattedString( "ExtendedEditPart.edit", new Object[]{getExtendedItemHandle( ).getExtensionName( )} ); 
			stack.startTrans( transName );
			int result = Window.CANCEL;
			try
			{
				result = builder.open( getExtendedItemHandle( ) );
			}
			catch ( RuntimeException e )
			{
				ExceptionHandler.handle( e );
				stack.rollback( );
				return;
			}
			if ( result == Window.OK )
			{
				stack.commit( );
				refreshVisuals( );
			}
			else
			{