In my app's print preview, all the buttons on the toolbar will not be updated
when clicked on.  For example, click on "Next Page" and the next page is displyed
but the "Prev Page" remains disabled.  Or clicking on the "Two Page" button and
two pages are displayed but the button does not update to "One Page".  The print
preview is Microsoft core code, I did not derive a class from it, therefore I'm
not controlling the buttons.  I do have another app that have a print preview and
the buttons work properly.  Does anyone what may cause this to happen?  Any help
is greatly appreciated.

Thanh Ha Hua