Kalim,

Create a page class that has your code in it already and use that class for creating the additional pages.

* PageClass.prg
DEFINE CLASS MyPage AS Page

FUNCTION Activate
Wait window "I am active"
ENDFUNC

ENDEFINE

Now use that class;

* some code in the form
WITH Thisform.PageFrame
   .NewObject("MyNewPage","MyPage","Pageclass.prg")
   WITH .MyNewPage
      .Caption = "Hello a new page"
   ENDWITH
ENDWITH

Now the pageframe in the form will have a new page added and that page will show the wait window when it is activated.