Currently it is not possible to respond to a custom click event of an element (e.g. Button) that is placed within the LineSeries.PointTemplate, however, you should be able to use the ChartSelectionBehavior to detect the "selection" action in the RadCartesianChart.SelectionChanged
event (note that the point marker does not utilize the RadCartesianChart.SelectionPalette
colors at the moment and it will not look "selected" out of the box but the SelectionChanged event will be raised properly -- the SelectionPalette is applied automatically to series that render separate items like bars, scatter points, etc.).
Our developers are aware of this interactivity limitation and will address it by Q1 2012 SP1 release at the latest.
the Telerik team
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