Cannot set NextPage=null programatically

Hi There,

I have the situation like these:

1) In The Wizard, I have about 10 wizard page defined

2) Every page can be the last page according to the selection in previous page

3) When this page (if it is suppose to be the last page) is selected I want Next Button to be disabled and Finish Button to be enabled.

So if I can set the NextPage on this page to null then I may be able to do that. But the situation is that this is not allowed according to the document.

My questions is how can I achieve this (the page to be the last one on the sequence) without remove the other pages from the wizard?

This is a very basic situation/condition I am not sure why we cannot do it.

By the way, I am using WPF 12.1 version.

Thanks

Gordon