Using WebGrease.config with bundling in ASP.Net project

Question

I'm trying to work on with new features in bundle that's using WebGrease.config file and unfortunately its not working like Bundle.Config file and i can't use its output virtual name. I learned from this site (http://webgrease.codeplex.com/wikipage?title=Example%20WebGrease%20configuration%20file) also this one (http://kenhaines.net/post/2012/06/25/How-to-use-Webgrease-Configuration-Files.aspx) after all I can't run css files with this WebGrease.Config file like old way with Bundle.Config file.

<Settings>
  <ImageDirectories>IMG</ImageDirectories>
  <ImageExtensions>*.png;*.jpg;*.jpeg;*.gif;*.ico</ImageExtensions>
</Settings>

<CssFileSet name="SampleCss" output="Style/css">
  <Autoname>
    <RenameFiles>true</RenameFiles>
  </Autoname>

  <Spriting config="Release">
    <SpriteImages>true</SpriteImages>
    <AutoVersionBackgroundImages>true</AutoVersionBackgroundImages>
  </Spriting>


  <Inputs>
    <Input>TestStyle.css</Input>
  </Inputs>
</CssFileSet>

Is there is something wrong with my file or is there is a way to call output link from my project.

Any help will be highly appreciated, Thanks.