Bug 116180 [SPM]Dataset can not be previewed in report designer on Mac
Description: Pull a dataset into the layout, preview in designer there is anothing displayed. Steps: 1, Create a sample datasource. create a dataset with sql statement "select * from CLASSICMODELS.EMPLOYEES" 2, Pull the dataset to the layout of the designer. 3, Preview, there is nothing displayed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/DesignElementDragAdapter.java
if ( TemplateTransfer.getInstance( ).isSupportedType( event.dataType ) )
			event.data = objects;
	}
	/**
	 * @see DragSourceAdapter#dragStart(DragSourceEvent)
	 */
	public void dragStart( DragSourceEvent event )
	{
		boolean doit = !getViewer( ).getSelection( ).isEmpty( );
		if ( doit )
		{
			IStructuredSelection selection = (IStructuredSelection) getViewer( ).getSelection( );
			Object[] objects = selection.toList( ).toArray( );
			if ( validateType( objects ) )
			{
				for ( int i = 0; i < objects.length; i++ )
					if ( !validateTransfer( objects[i] ) )
					{
						doit = false;
						break;
					}
			}
			else
				doit = false;
			if ( doit )
				TemplateTransfer.getInstance( ).setTemplate( objects );
		}
		event.doit = doit;
		if ( Policy.TRACING_DND_DRAG && doit )
		{