Hi,
In order to display a different aspx page, you would need to use iframes. It will be something like this:
Code: HTML/ASPX
<eo:PageView runat="server" id="PageView1">
<iframe src="your_page.aspx" />
</eo:PageView>
However the tricky part is how to get user input from each of these separate pages when the user is done. Submit the hosting page (the page where you have the MultiPage control) will NOT submit the iframe pages, so if you use a server button to "save" all the changes, you won't get any of those values that does not belong to your hosting page. If you use client side script to collect the value then it won't be an issue.
So if you have to use server side event, you may wish to use user control instead of separate .aspx file.
Thanks