DropDown popup focus out

How would I go about detecting when the popop of a DropDown or DropDownDataGrid has been dismissed, either by or clicking outside the box?

I'm trying to automate actions on a canceled filter search.

There is no such event.

Do you plan to implement the event to show when a dropdown Opens and Closes?

We don’t have immediate plans to implement such events.

Thank you for the quick replies, Enchev. I'll think of a workaround.