return !SessionHandleAdapter.getInstance( ) .getReportDesignHandle( ) .getVisibleDataSets( ) .isEmpty( );
return !SessionHandleAdapter.getInstance( ).getReportDesignHandle( ) .getVisibleDataSets( ).isEmpty( ) || ( getSelectedElement() != null && getSelectedElement( ) .getDataSet( ) != null );
	protected boolean calculateEnabled( )	{		return !SessionHandleAdapter.getInstance( )				.getReportDesignHandle( )				.getVisibleDataSets( )				.isEmpty( );	}