Please implement TAdvGroupBox.ItemIndex property

When several radio-buttons are placed on a TAdvGroupBox:

Please add a ItemIndex property to TAdvGroupBox. The value of TAdvGroupBox.ItemIndex will be automatically set to the checked radio-button when the user checks one of the radio-buttons.

This would be easy to implement and would be very useful as it would save the developer to write cumbersome and lengthy code to determine which radio-button is checked.

The TAdvGroupBox is designed to host any type of control, not perse radiobuttons, so, an ItemIndex would only make sense when the TAdvGroupBox has radiobuttons. In that case, a radiogroup control is better suited.

This feature will not be implemented.