Hello, <br><br>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 &quot;state: #pressed&quot;. I'm quiet new @ squeak and i realy don't know whats necessary to be pasted here. 
<br><br>Has anybody a good tutorial how to use those RadioButton's in a way like i can use them in visual studio.<br><br>Thanks for any suggestion<br><br>Andreas<br>