Using Lambda expression in XAML databinding

When I was in net last week end the below links took my attention.The reason was they explain how can we give lambda expressions in XAML.As a developer you might also wonder how the author did that.
It is by creating a custom markup extension and constructing lambda expressions on the fly.

• WPFix Part 1
• WPFix Part 2 (Binding Extension)
• WPFix Part 3 (Extension Methods)

Thanks to M. Orçun Topdağı for such a smart solution.I need to find out another way to implement this in my current project as that is in Silverlight and Silverlight does't support custom mark-up extensions.