>>Maybe you're using a framework and/or disabled Ctrl+0 behavior. It works at runtime.
>>Cetin
>
>It doesn't work even with the simple test form I created. E.g. the form starts with no selection. But then I select something and then try to press Ctrl+0. Nothing happens. What is different in my combo? It's bound and bound column=2. ControlSource is not set.

Simple test form based on a framework? I also just tested it in one of my exe, it works (not framework based - the one I tested also had no menu, no code to override VFP key settings).
As I said if somehow you didn't disable Ctrl+0 behavior (ie: On key,keypress) it works at runtime. As a workaround if disabled, you might add an "-No Selection-" item using union in your rowsource SQL.
Cetin