Intellisense problem for asp.net skin files

I noticed that .skin file type Intellisense is not active. for theming your application,
after searching i know how to configure Visual Studio to provide intellisense for .skin files.
Here's how:

1. Go to Tools->Options menu.
2. Pick Text Editor -> File Extesion from a tree at the left part of Options dialog.
3. Type skin in Extesion text box.
4. Select User Control Editor from Editor dropdown.
5. Click Add and then Ok to close dialog and re-open your skin files.