Tooltip not showing individual data value when no marker

[wxz44428]

I am using ver 7.0. Render mode is Image.

For line chart, if the series' markershape is set to none, then the tool tip on the line will shows the range value between the two points. However, I want tooltip to show the data point whose location is closest to the mouse location (when mouse is resting on the line), that point's value. What's the trick to realize this ?

 

Thanks. 

 

[wxz44428]

Ignore this post. It turns out that once I used Chart.Data.Clear() and uses my own data, it behaves fine.