How does a ComboBox capture mouse when it is dropped-down?

Question

I am trying to model the behavior of a ComboBox dropdown (or other drop downs for that matter, including context menus) where the drop down closes when you click anywhere el

Answer 1

The templates of the controls you've mentioned are using for the dropdown lists a popup as a container with the StaysOpen property set on false (which is the default i think).

ComboBox template example