Is there a WPF-style MessageBox?

Is there a WPF-style MessageBox?

Extended WPF toolkit has now message box control.

Download:

http://wpftoolkit.codeplex.com/releases/view/51736

documentation:

http://wpftoolkit.codeplex.com/documentation

message box control:

http://wpftoolkit.codeplex.com/wikipage?title=MessageBox&referringTitle=Documentation