<oRadioGroup>:getAccel(<nInkeyValue>) --> <nPosition>

        <nInkeyValue> is a numeric value that indicates the inkey value to
        check.

        Returns a numeric value that indicates the position in the radio
        group of the first item whose accelerator key matches that which is
        specified by <nInkeyValue>.

        getAccel() is a method of the RadioGroup class that is used for
        determining whether a key press should be interpreted as a user
        request to select a particular radio button.  getAccel() accomplishes
        this by calling the getAccel() method of each of the radio buttons in
        its group.