The Forms collection is not a member of any individual form, but rather is a member of the Application. I would suggest trying the following:
Dim f As Form
For Each f In Forms
f.WindowState = 1
Next
This will minimize all forms, so you may want to place some conditional on that such as
if f.Name = "<formname>" then
f.windowstate = 1
endif
Good Luck
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As a circle of light increases so does the circumference of darkness around it. - Albert Einstein