Xhader's just the way I combined Xaml and Shader words into one "Xhader". This project tries to simplify the usage of Shaders in your Silverlight and WPF applications by providing:
See more information at:
Documentation
On the other hand, if you're interested in creating your custom shader, then you might take a look at:
Quick usage sample
As part of the built-in sample ,here are two captures of the screen. First image is the WPF sample application without using the shader
The same WPF sampel demo, but using some shaders to modify the how the UI looks like.
Into the documentation you will find a video where you can see how this project pretends to simplify the usage of the Shaders. More information at Documentation