Remember the Spy++ tool shipped with Visual Studio long ago?
I was a fan of this tool, as it tells me the internals of any windows application and the controls that compose its GUI.
Trying to use this tool with .net application will tell you no useful information, because it examines the Win32 structures inside the application which is not the same thing from a .net developer point of view.
A bunch of tools will provide the same features but for .net world, here are some links:
Runtime Object Editor