Visual Studio create extension for Solution Explorer


I am writing extension for Visual Studio which will allow me to add items to Solution Explorer such as class, variables etc. I have language that is not supported in Solution Explorer.

Is it possible to code against file in the Solution Explorer such as adding to the right click menu items when clicking on a file? If it is, how could I do that? Is there some example of code?

I want to customise this

Source: Visual Studio Questions