How can Rating Control triggers a event where i click the CurrentRating?

a Rating Control Question

when i clicked the star what was not CurrentRating, it triggered a Changed event,
but i clicked the CurrentRating star, nonthing happened.

now, i'm writting a project. it's needed to show a rating of a item, and allow users to rate it.
i encountered a trouble, user can't rate by the same rating

for example, the current rating is 3, a user wants to rate by 3, but no event been triggered, because Rating control only has Changed event.
if rating were not changed, no event occured.

how can i resolve the problem? write a new control class to extend Rating? or other easier methods?

hi, can someone help me ?