I just started adding support for the Windows 7 taskbar jumplist to my WPF application, using the excellent .NET wrappers in the Windows API Code Pack.

After creating the jump list, file selection via the Windows common file dialogs should automatically cause entries to appear in the Recent section of the jump list.

But no.  What's going on?

It turns out that everything is working as expected.  However, you need to have the "recent items" checkbox enabled for the taskbar:

If you put a TextBox inside a ScrollViewer, the TextBox will take as much width as it needs, even if you set TextWrapping to Wrap.  That means that a long line of text will just stretch out to the right, beyond the right edge of the ScrollViewer, instead of wrapping.

Fortunately, you can bind the Width of the TextBox to the ScrollViewer ViewportWidth.  This makes the text wrap at the right edge of the ScrollViewer.  If you hide the horizontal scrollbar, you get just what you'd expect - vertical scrolling and horizontal wrapping.  This also allows the ScrollViewer to participate in a flow style layout and still have the text wrap correctly.

I'm posting this for future reference.  If you invoke a PageFunction and add an event handler to the PageFunction's Return event, the event handler must be an instance method of the calling page.  No other method will do.  If the event handler doesn't meet this criteria, you'll see the FatalExecutionEngineError thrown when you return from the PageFunction.  Sorry, no separation of concerns allowed.

More details in this forum thread: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1975763&SiteID=1.