http://www.xulplanet.com/tutorials/xultu/inputs.html
http://www.xulplanet.com/reference/elemref/ref_radiogroup.html
A group of radio buttons. Only one radio button inside the group can be selected at a time. The radio buttons may either direct children of the radiogroup or descendants. Place the radiogroup inside a groupbox if you would like a border or caption around the group. The radiogroup defaults to vertical orientation. To set the radio button that will be selected by default, set the selected attribute of a child radio element.
A group of radio buttons. Only one radio button inside the group can be selected at a time. The radio buttons may either direct children of the radiogroup or descendants. Place the radiogroup inside a groupbox if you would like a border or caption around the group. The radiogroup defaults to vertical orientation. To set the radio button that will be selected by default, set the selected attribute of a child radio element.
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nsIAccessibleProvider
nsIDOMXULSelectControlElement
Indicates whether the radiogroup is disabled or not. If this attribute is set to true, the radiogroup is disabled. This is usually drawn with the text in grey. If the radiogroup is disabled, it does not respond to user actions. The element cannot be focused and the command event will not fire. The element will still respond to mouse events. To enable the radiogroup, leave the attribute out entirely as opposed to setting the value to false.
This attribute is set to true if the radiogroup element is focused.
Connects the radiogroup to a corresponding preference. This attribute only has any effect when used inside a prefwindow. The value of the preference will be updated to match the value property of the radiogroup.
The tab order of the element. The tab order is the order in which the focus is moved when the user presses the Tab key. Elements with a higher tabindex are later in the tab order sequence.
Returns the value property of the currently selected radio button. To change the selection, use the selectedIndex or selectedItem property.
Returns the accessibility object for the radiogroup.
appendItem ( label , value )
Creates a new radio element and adds it to the end of the radiogroup. You may optionally set a value. The function returns the new item.
checkAdjacentElement ( dir )
Deselects the currently selected radio button in the group and selects the one adjacent to it. If the argument dir is true, the next radio button is selected. If it is false, the previous radio button is selected.
Holds the currently focused item in the radiogroup, which may or may not be the same as the selected one. You can change the focused item by setting this property.
insertItemAt ( index, label , value )
Creates a new radio element and inserts it at a specific position in the radiogroup. You may optionally set a value. The function returns the new item.
removeItemAt ( index )
Removes the child item in the radiogroup at the given index. The function returns the removed item.
Holds the index of the currently selected item in the radiogroup. If no item is currently selected, this value will be set to -1.. You can select an item by setting this value.
Holds the currently selected item in the radiogroup. If no item is currently selected, this value will be null. You can select an item by setting this value. A RadioStateChange event will be sent to the selected radio button when it is changed either via this property, the selectedIndex property, or changed by the user.
Get and sets the value of the tabindex attribute.