How to add radio buttons in button group?

After dragging and dropping button group in Netbeans 7.2, how to add radio button in that button group?

What is button group in radio button?

A radio button group is a container control that holds radio buttons. The radio button group defines the layout for the buttons it contains, including a group title, text alignment for button labels, and whether or not to show a border. You can place a radio button group control within a section control.

What can you add to a button group?

You'll usually add only radio buttons to a button group, but you can add regular buttons or check boxes, too. Button groups have nothing to do with the visual appearance of the buttons on the screen. Instead, button groups simply provide a logical grouping for the buttons.

There's a Button Group field in the radio button's property. Set this value for each of the radio button that you want to add in the group to the button group's name.