This new Reflector.Addin creates a Method Graph where the vertex are methods, and the edges represent an invokation of a method. By clicking on the vertices, you jump to the next method, while keeping record of your previous steps.

Let's see this on FileStream.WriteByte method as shown above. The figure above is generated by right-clicking on the FileStream method and selecting "Method Invokation Graph". If I choose to to click FlushRight, the graph changes to: