OptionItem.Touch Property
This event occurs when you change the options of the option button.
It occurs regardless of the operation from the screen or the operation from the script.
Note
In the handler of the event that occurred in the OptionItem class, do not use the Value property of the parent object OptionButton class to refer to the selected item number. (The selected item number may not be reflected.)
For the selected item number, refer to the Index property (subscript of the array) of the From property (OptionItem object) of the Event object passed as an argument of the event handler.