We recommend using our new chart control, RadChartView over RadChart. It is an improved version of the old chart which brings better performance and more flexibility. You can also take a look at the documentation about the chart's Tooltip behavior.
One easy way to implement the desired behavior is to add additional property to your view model or a method in the code behind, which will format the real value.
public string MyToolTip
{
get
{
return (string.Format("{0}", Math.Round(this.MyValue, MyMidpointRounding.MyAwayFromZero)));
{
}
Then you can bind this property to the element defined in the ToolTipTemplate.
Regards,
Ivan
Telerik
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