Look for a custom keypress event on the form or combobox control that intercepts the tabs. If there, let it do the default for those keys...

>>Hi All:
>>
>>Does anyone know why I can tab or downarrow (forward) out of a combobox but I can't shift+tab or uparrow (back) out?
>
>
>Hi Luke,
>
>I just tested with combobox and few textboxes on new form in VFP8SP1. The shift+tab and uparrow move focuse from the combo to the previous control in the tab order. Maybe something in your code causes the problem?