Use VBA code to change tabs (or pages) on a multitab / multipage form in Outlook

I created an Outlook 2003 form with two pages (e.g. P.2 and P.3) displayed.
When a user opens the form it's on the first page (e.g. P.2).  While completing the form, if they put a check in the box "Fees Paid" (name = chkFeesPaid), then I'd like the form to automatically switch to the next tab (or page) which is named P.3.

Here's my visual basic code so far, but I don't know how to get the focus on P.3.
   if Item.UserProperties("Fees Paid").Value = true then
      msgbox "Complete Credit Card Information on Page 3"
         NEED CODE HERE TO PUT THE FOCUS ON THE TAB OR PAGE 3
            Else
               End if

Can anyone help me.  Thanks in advance.