How to add radio buttons in button group?

buttongroup, java, jradiobutton, netbeans, netbeans-7.2

Solution

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.

Problem

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

Original source