[pygtk] How do I set radio buttons from a program

[Peter Robinson]

I am writing a simple applet whose button3 menu contains a list of radio 
buttons.
When the applet starts up I want to be able to run a test and base the 
radio button settings on the result of the test.
I have spend many hours looking at tutorials, manuals and google'ing for 
an answer to my problem without any luck.

Any suggestions?

Peter Robinson