You shold work with option group as whole. Something like

OptionGroup.Value = 2

>I have a set of readio buttons in a Group, as well as a checkbox control. When I click on the checkbox control, I expect it to set the value of OptionGroup.Option2 to 1.
>
>It works fine, unless I first select a radio button suhc as Option1 or Option3 and so on; then when I click on the CheckBox that sets the Option2 on, I see that both Option1 and Option 2 are selected. But, how can this be? Do I specifically need to check each Radio Option Button to see if any of them have a value of 1 before I set the value of Option2 to 1 (or on)?
>
>Does anyone understand what I wrote above?