I was not able to reproduce the described behavior - the SelectionChanged event wasn't fired when moving the mouse cursor over the dates. Could you please share some more details on the exact scenario- what version of the controls you are using? I can also suggest you the following example from our blogs which demonstrates how to implement SelectedDates attached property for the Calendar - it might help you to achieve the required:
Hope this helps. If you have any further questions let us know.
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