This event occurs when the user is selecting a region on the chart using "drag to select" mouse actions.
WPFSelectionEventHandler is a delegate representing the signature of the method that can be used to handle hot spot events. It is declared as follows.
Public Delegate Sub WPFSelectionEventHandler(sender As Object, e As WPFSelectionEventArgs)
public delegate void WPFSelectionEventHandler(object sender, WPFSelectionEventArgs e);
In the above, "sender" is the object that raises the event, and "e" is a WPFSelectionEventArgs
object that contains the event data.
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