Display dynamic page number in message box

[Only_Dob]

I have a simple chkbox snippet that displays a subform further down the document.  I would like a messagebox to pop up on the Enter function for that chkbox that reminds them a new section is open and page number is X.

message box is easy enough, but I can't get a dynamic display of the new page.  Any help is appreciated

This is what i'm looking for:

xfa.host.messageBox("Please complete the Minor Test section") + minortst.pageNumber;

Thanks!