set .Visible = True on Subform, From Another Subform

I have a "master" form which contains a few subforms that are shown or hidden depending on the context of the master form (which options are selected, etc.).

In one subform, the user enters audit information. I attempting to make the AfterUpdate subroutine set on that subform to hide itself and show another subform. There is a button on the master form that does just this, but I want it to do it automatically when the user updates the record. I just can't seem to get it to work, though.

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Me.Parent.cmdPostClosingMemo_Click looks like this:

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The cmdPostClosingMemo_Click subroutine runs, because the lblTitle lable changes, but the subforms do not hide/unhide.

I've played around with the syntax, done oodles of Google searches, etc. Can someone help me out?

Me.Parent.SetFocus does not work. Neither does Me.Parent.cmdPostClosingMemo.SetFocus. It changes the lblTitle.Caption, but just doers not hide/unhide the subforms.

Looking at this site (http://access.mvps.org/access/forms/frm0031.htm) I am thinking maybe it is not possible to control a subform from another subform. The "To refer to a subform control property, like SourceObject" section has N/A if you are on the parent form or any subform. If this is the case, I can't imagine what the reason is. Should I SetFocus on another for briefly and have that form's "SetFocus" event do the work?