>I have a ComboBox control within a form that has a lot of code in the InteractiveChange event. After user has made\changed a selection and the code has fired, the value the user has chosen has been 'wiped out' of the control.
>
>After spending a lot of time re-writing my method code without success, I entered NODEFA as first line of InteractiveChange - and never called DODEFAULT() within InteractiveChange event. The control worked fine this way (i.e., value was displayed in control).
>
>Is there any way to access the VFP ControlBox base class so I can step-through the code to find the "glitch" (or 'feature') so I can possibly change it?
>
>Thanks - Victor

There's no glitch. The native code fires *after* your code and the combobox value is set at the end of the InteractiveChange event.
Move the code to the Click or Valid event (I prefer Click), and the value is set first.
e.g., If at the top of the IAC you put

? this.value

it will show the previous value
In the Click or Valid it will show the current (expected) value.
HTH.

ps: DoDefault() is actually irrelevant in this case. The native behavior always fires, unless you issue a NoDefault as you have.
DoDefault() is used to fire parent class code if the parent class is another custom class and there is code in the subclass. Once you put a single character of code in the subclass method, the parent class method is overridden and you must use DoDefault() to get the parent's default behavior.
They are rather ill-named :)