>>>I am calling SetFocus() of a textbox from a custom method of a form. My problem is the SetFocus() fires, but the object loses focus. It appears that a TAB is being processed after the SetFocus(). Anyone have any ideas?
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>>Do you mean that TAB fired implicitly? I guess, you could try NODEFAULT together with SetFocus().
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>This problem actually exists as part of my error handler where I deal with field level validation rules. I give the user the RuleText from the DBC and then want to place the cursor back in the control that had the offense. However, I think the TAB that the user pressed to leave the textbox is being processed after I do my SetFocus()

If it's really so, you could catch TAB in KeyPress event, NODEFAULT it there and fire Setfocus() programmatically to launch Validation.
Maybe, you can just return .F. from valid?