Get selected radio button from radio group (ExtJS)

I'm looking for proper function in ExtJS which will bring me back a selected radio button 开发者_StackOverflowfrom radio group, is there anything like that?

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On Ext.form.BasicForm there is a method called getValues() you can pass the id of the control and it will return its value

formPanel.getForm().getValues()['radioGroup'];

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thanks for all, who helped me to find out the tricky one.. here is my solution

Ext.getCmp('form_window_id').getForm().getValues(['radioGroup_id']).groupname

it works fine in ExtJs3.4...

--Ashish