I have a WinForms application (VS 2008, .NET 3.5) that has a form with two different group boxes, and inside of each group box are different sets of radio buttons. When I r
Set Auto Check to "False" on all the radio buttons, both groups. Set them all back to "True".
This worked for me.
I also had to group boxes the one was good the second one came with the first button checked (selected).