.validateForAdding( design, container, content ) );
.validateForAdding( design, container, slotId, content ) );
	protected List checkContent( ReportDesign design, DesignElement container,			int slotId, DesignElement content )	{		List errors = super.checkContent( design, container, slotId, content );		if ( !errors.isEmpty( ) )			return errors;		errors.addAll( TableHeaderContextContainmentValidator.getInstance( )				.validateForAdding( design, container, content ) );		return errors;	}