The graphic item is used for selecting one of N items represented by the text row. The selected item highlighted.
The "Radio" term originated from the old radio receiver buttons - it used to be mechanical buttons: if one is pressed, then the other is released.
The selected item is specified by index (zero-based index). The index of the selected item can be got, for example, by the Value
Possible data binding specifies the variable into which the value related to the selected item is transferred. The data binding is here "for read and write", it means that if the variable of the data binding is changed by other methods, then the change of this variable is reflected into the change of the selected item.
If the selected text is changed then the onDataEditAccept
event is called. Thus the radio buttons can be understood as Menus