I've published a version of this for Visual Studio 2013. It can be downloaded here:http://karlshifflett.wordpress.com/2014/05/21/xaml-intellisense-presenter-for-visual-studio-2013/
This custom Visual Studio 2010 XAML Editor IntelliSense Presenter provides additional productivity features for WPF & Silverlight developers while working in the XAML Editor.
A full and detailed write up can be read here: http://karlshifflett.wordpress.com/2010/03/21/visual-studio-2010-xaml-editor-intellisense-presenter-extension/
Below images show the Pascal case lookup and the narrowing filter features in action.