Double clicking (quickly) on a combo box (String) will cancel the next click event for the ComboBox (String)

A user has found that if they quickly double click the combobox (string) the next time they click it, it will not open as it should. They will then have to click an extra time to open the combobox (string)

1. Open attached project
2. Click play
3. Double click the ComboBox (String)
   This is the widget with the drop down arrow
4. Click the ComboBox (String) once more
5. Notice the drop down menu does not appear
6. Click it once more
7. Notice it now shows up