Why not try this.

Create a Property on the form...let say. CallThisFunction

The set the property to the function you want to call

eg.. ThisForm.CallThisFunction = "ThisForm.Function1()" or
ThisForm.CallThisFunction = "ThisForm.Function2()" or
ThisForm.CallThisFunction = "ThisForm.Function3()"

In All the pages activate method...put this code.

lFunction = ThisForm.CallThisFunction

&lFunction ..will execute whatever method is currently assigned to ThisForm.CallThisFunction

Carl