Setting a series crosshairEnabled to NO its not working



Im displaying 3 series in a chart, for 1 of them I would like NOT to display the crosshair, so in the 

- (SChartSeries *)sChart:(ShinobiChart *)chart seriesAtIndex:(int)index

I check the index and when creating the series I set the   series.crosshairEnabled = NO; , but still that series is displaying the crosshair.

Any suggestions what am I doing wrong?