Cannot call SetFocus from within a When, Valid, RangeHigh or RangeLow event (Error 2012)

The SetFocus method conflicts with these events, which are testing to see if the object can get or lose focus.

You are calling SetFocus from a When event.

Call SetFocus from the GotFocus event instead.
You are calling SetFocus from a Valid,В RangeHigh, or RangeLow event.

Call SetFocus from the LostFocus event instead.