[AccessD] Getting error of Ribbon argument

Private Sub Command0_Click()
  'Hide 2007 Ribbon.
  DoCmd.ShowToolbar "Ribbon", acToolbarNo
End Sub

Private Sub Command1_Click()
  'View 2007 Ribbon.
  DoCmd.ShowToolbar "Ribbon", acToolbarYes
End Sub

Trying to apply these and both arguments generate a run-time error in Word 
2007 -- says variable not defined. The Office 12 Object Library is 
referenced. Works fine in Access 2007 -- is this capability not available in 
all the 2007 apps?

Susan H.