New XAML/BAML Parser Engine

WPF 4 has replaced its implementation of XamlReader.Load(), BAML loading, Control & DataTemplates functionality with a new engine built on top of the new System.Xaml.dll.  As part of this effort, we’ve fixed many bugs and made many functionality improvements. Users of XamlReader.Load() can take advantage of several new language features in XAML2009 such as support for generic types. MarkupExtensions and TypeConverters can now get more services during object graph creation, enabling more scenarios, such as access to the Root object. Tools to analyze and manipulate XAML will also be much easier to create with many of the new low level APIs provided in System.Xaml.dll.