dataSetHandle = ( (ReportItemHandle) handle ).getDataSet( );
dataSetHandle = DEUtil.getFirstDataSet( handle );
	public BindingExpressionProvider( DesignElementHandle handle )	{		super( handle );		if ( handle instanceof ReportItemHandle )		{			dataSetHandle = ( (ReportItemHandle) handle ).getDataSet( );		}		else if ( handle instanceof GroupHandle )		{			dataSetHandle = ( (ReportItemHandle) ( (GroupHandle) handle ).getContainer( ) ).getDataSet( );		}	}