how to get the string in a choicegroup.popup...

here is my sample code...

Form frm=new Form("Sample");
ChoiceGroup cg=new ChoiceGroup("Sample",Choice.POPUP);

int index=cg.getSelectedIndex();
String str=cg.getString(index);

but i got null pointer exception..
anybody knows about it????

You did not indicate selection with setSelectedIndex(int elementNum, boolean selected) . You need to select as GroupChoice is rendered without any pre-selection

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