Windows Forms-Based Domain-Specific Language: Resources

Hello,

I'm trying to develop a Visual Studio Extension using Windows form based DSL but... It is really complicated to find any article on that subject. I don't know how I can develop what I want without any explanations :-D

Would someone have some usefull resources on that subject ? I searched on google but didn't fin anything except http://msdn.microsoft.com/en-us/library/dd820642.aspx.

Thanks