Although I am getting a reference missing error message in Excel 2007, in Excel 2003, the assembly does not show up in its references section either yet it works there. I thought the MultiPage control was a standard Microsoft control and s owould be available on other computers.

I have managed to resolve this issue though by replacing the MultiPage control with 2 frame controls, and writing a method to show and hide the appropriate frame.

Great you got it solved

Oh, how many times have I run into something as you have: you find a solution, but find there is something missing -- You stumble around till you come up with some off the wall solution