RadioButton's

Hello, 

i have a problem with the ThreePhaseButtonMorph. I want to realize 3 radioButton to chose a degree of difficulty. I one button is chosen, no other should be "state: #pressed". I'm quiet new @ squeak and i realy don't know whats necessary to be pasted here. 

Has anybody a good tutorial how to use those RadioButton's in a way like i can use them in visual studio.

Thanks for any suggestion

Andreas
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