http://blogs.msdn.com/b/delay/archive/2011/02/21/night-of-the-living-wm-deadchar-how-to-avoid-problems-with-international-keyboard-layouts-when-hosting-a-winforms-textbox-in-a-wpf-application.aspxThere was a minor refresh for the Microsoft Web Platform last week; you can find a list of fixes and instructions for upgrading in this forum post . The most interesting change for the WPF community is probably the fix for a WebMatrix problem broughtenTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)