Hide ribbon event not working

I'm terrible with VBA so this might be something really simple. In
Access 2007, I have a startup form with this event on load:

Private Sub Form_Load()
DoCmd.SelectObject acTable, , True
DoCmd.RunCommand acCmdWindowHide
DoCmd.ShowToolbar "Ribbon", acToolbarNo
End Sub

and this on close:

Private Sub Form_Close()
DoCmd.SelectObject acTable, , True
DoCmd.ShowToolbar "Ribbon", acToolbarYes
End Sub

I've also tried the first event as on open and there is no apparent
difference in functionality. I got the code from searching for ways
to hide the ribbon and navigation pane. These codes work perfectly
for the navigation pane but don't seem to affect the ribbon at all.
I've also tried splitting the first event up between on open and on
load (hiding the nav pane on open and the ribbon on load) but that
didn't work either. Any ideas on why hiding the ribbon isn't
working? I swear I've gotten this to work before, without having to
create a custom ribbon or anything, I just can't remember how.