I think a found a relatively simple solution which uses a form's WindowWidth property.
I discovered that when a form is minimized (at least on my database), the form's WindowWidth = 1920. So, here's the sub I developed to determine if a form is minimized...
Sub Determine_Form_Min()
For Each dbsform In Access.Forms
If Forms(dbsform.Name).WindowWidth = 1920 Then
‘Execute your code here
End If
Next dbsform
End Sub
-illini