D1: MDI Focus to Children

I have a regular TComboBox on a toolbar of a MDI Main form.  What I
*want* to have happen is after a value is selected, the focus goes to
the Active MDI Child.  I tried this with a SetFocus command.

Doesn't seem to work.  In fact, when a MDI Main form has the focus,
there doesn't seem to be an Active MDI Child (set to nil).

Any ideas on how to do this?

TIA,

Greg
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