Why JRadioButtob.setSelected(boolean) doesn't work?

I implement an inner class claaes ControlPanel, subclass of JPanel, which have a GroupButton of two JRadioButtons. The state of the JRadioButton will be changed according to the selected item from a JList. My code structure as follow:
public MainClass{
MyJList.addListSelectionListener(new ItemSelectionListener(){
public void valueChanged(ListSelectionEvent ..){
myControlPanel.b1.setSelected(true);
}//end of main class
//inner class
class ControlPanel{
ButtonGroup myGroup = ;
JRadioButton b1 = ;
JRadioButton b2 = ;
myGroup.add(b1);
myGroup.add(b2);
anybody help me. Thanks!!
Qi

did you initialize b1 before you call setSelected(true)?

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