Thanks for the help. Do you see any pitfalls in this approach?

1. Add new property to baseclass called LRETURN and set value to .NULL.
2. Add code to GotFocus() to reset value back to .NULL.
3. In the Valid() put the following:

    IF THIS.READONLY
        * Set lReturn so a subclass knows that a STOP occurred.
        THIS.lReturn = .T.
        RETURN (THIS.lReturn)
    ENDIF

4. Each time I subclass this control, I'll need to put the following in the Valid(), if available validation is necessary:

    DODEFAULT()

    IF ISNULL(THIS.lreturn)
*!*	* Do necessary validation for this subclass such as:
*!*	IF EMPTY(THIS.VALUE)
*!*	    * Set lReturn so a subclass knows that a STOP occurred.
*!*	    THIS.lreturn = .F.
*!*	    RETURN (THIS.lreturn)
*!*	ENDIF
    ELSE
        * A return value was assigned by parent class.  Use it.
	RETURN (THIS.lReturn)
    ENDIF