Used to group multiple radio buttons. In one radiogroup. Only one radio button may be selected at a time.

<window title="Radiobox &amp; Radio Demo" >
<vbox>
<radiogroup onCheck="fruit.value = self.selectedItem.label">
<radio label="Apple"/>
<radio label="Orange"/>
<radio label="Banana"/>
</radiogroup>
You have selected :<label id="fruit" style="color:red"/>
</vbox>
</window>

Note: To support the versatile layout, a radio group accepts any kind of children , including Radio. On the other hand, the parent of a radio, if any, must be a radio group.