Starts an option selection sequence (i.e. a selection sequence where the Shift key was pressed). 
Notes to Inheritors: Subclasses can override this method to be notified at the beginning of an option selection sequence.
 Overriding methods must still call base.StartStandardOptionSelection() for correct behavior. 
PSelectionEventHandler Class | UMD.HCIL.PiccoloX.Events Namespace