Clicking the StatusBar causes the event to be executed more than once.

[BDisp]

There is something strange when clicking a button in a Dialog. Try opening the InteractiveTree scenario and clicking Add Root in the status bar. The Dialog will open and after typing the node name click on the Ok button. The Dialog closes and opens again despite Application.RequestStop having been called. Therefore, the Dialog should not open and the same happens with the Cancel button.

It is a good idea to create a unit test to prevent this bad behavior from happening.

Originally posted by @BDisp in #3555 (comment)

[tig]

Fixed and tests added.