I have a group of 4 Outlook::OlkOptionButton's that I want to make tri-state.
By tri-state I mean I want the user to be able to select either 0 or 1 of the
4 buttons. If he clicks on a button that is already set, it should turn off
the button and then 0 of the buttons would be selected. Is that possible? Do
I need to use a different button type?