How to show a tooltip for Column Chart AxisX categories?
have a look at this thread; in my first response i provided sample code to do this.
http://forums.labs.infragistics.com/forums/p/4740/28164.aspx
I mean when mouse over one label of the X-Axis, a tooltip shows up to show what the label is.
i am not sure what you mean by that, but try setting the Tooltips.FormatString property to "<SERIES_LABEL>"