I was looking through manuals and examples but I couldn't find how to put a
ButtonGroup on a Frame. For example:

Frame fr = new Frame();

JRadioButton r1 = new JRadioButton("Dec");
JRadioButton r2 = new JRadioButton("Hex");
JRadioButton r3 = new JRadioButton("Oct");
JRadioButton r4 = new JRadioButton("Bin");

ButtonGroup g1 = new ButtonGroup();

Now - how do I put ButtonGroup on a Frame?

Thanks,

Zalek