>>>>If you want to take action based on the user selection in the combobox, you can use the Click() event.
>>>
>>>lostfocus() works as well...
>>
>>LostFocus() will only be fired when he exit he control not when he makes a selection in the combobox.
>
>
>A lot of times the user won't be using the mouse but the keyboard to scroll through a combobox list, so click() won't fire.

Use Programmatic/Interactive Change and don't worry about user navigation skills.