JRadioButton's not being clicked when clicked--?

[System_Error]

I have a JMenu with some radio buttons...For some reason, when I click the stupid things, they won't do anything...and by that, I mean they want change their state to being clicked(as in the circle being filled)..It's like they are disabled...I'll post the snippets of code with them in it:

	JMenu formatMenu = new JMenu("Format");
		ButtonGroup bg = new ButtonGroup();	
		rb0 = new JRadioButton("###",false);
		rb0.addActionListener(this);
		rb2 = new JRadioButton("###.##",true);	
		rb2.addActionListener(this);
		rb4 = new JRadioButton("###.####",false);
		rb4.addActionListener(this);	
		rb6 = new JRadioButton("###.######",false);
		rb6.addActionListener(this);
		
		bg.add(rb0);
		bg.add(rb2);
		bg.add(rb4);
		bg.add(rb6);
		formatMenu.add(rb0);
		formatMenu.add(rb2);
		formatMenu.add(rb4);
		formatMenu.add(rb6);

Why would I not be able to click these buttons?


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