Vista - DocumentViewer, annotations and XPS

Hi all,

I had a quick look at the DocumentViewer control and the usage samples in
SDK. It is a promising approach for my application to build a viewer showing
various document formats by first convertig them to XPS and use this control
for display and print. Some general question regarding the design of my
application:

1) Annotations
The samples also demonstrates using annotations. But I have the requirement
to display an extendes set of custom annotations (graphical objects, stamps,
etc.) Is it intended by the design to integrate custom annotations in the
framework? What would be the way to do this? Derive from
System.Windows.Annotations.Annotation?

2) dynamic XPS creation at runtime
When I have documents containings several thousands of pages it is not
feasible to download them completely.
Does the control suppport dynamic generation of individual pages at runtime?
Is there a mechanism like UI virtualization built in to support this? The
scenario is: User triggers command display page 3411, application should
render this single page to XPS and display it.

3) Hyperlinks
Does the XPS spec and the DocumentViewer control support some form of
hyperlink where the application intecepts the activation of the hyperlink and
processes it.

Any help hints or available sample code would be appreciated.

Thanks Jens