A radio row, like a radio column, contains radio button tiles, only one of which can be selected at a time.
Supported Platforms: Windows only
: radio_row {
   alignment children_alignment 
   children_fixed_height children_fixed_width 
   fixed_height fixed_width height label width 
}
Radio rows can be assigned an action.
A quoted string containing the key of the currently selected radio button (the one whose value is "1").