Controls on Multipage PropertyManager Page
All of the controls for a multipage PropertyManager page must be contained
on a single page.
Your add-in must simulate the appearance of multipage controls by showing
and hiding the appropriate controls (the add-in must know which controls
to show on each page) as the user moves from page to page. This means
that your implementation of IPropertyManagerPage2Handler8
must know which page is currently in use and act accordingly within the
IPropertyManagerPage2Handler8::OnNextPage
and IPropertyManagerPage2Handler8::OnPreviousPage
callbacks.
Your add-in must not respond to the next page handler by trying to show
a second page because:
The first page will close.
When the next page handler returns control to
the SolidWorks application and your code, the first page is gone and a
memory error occurs.