learning class hierarchies and dependencies

Question

hi,
is there anywhere those metadatas from system classes ('headers') in files, or any way to export those myself?
as a wpf beginner i find it quite a hard to find class hierarchy and dependencies easily, i'd prefer "find in files" method.

for example i have an instance of DoubleAnimationUsingKeyFrames and need to add keyframes, now i need to find classes inherited from DoubleKeyFrame class.
only inherited class i know of is SplineDoubleKeyFrame, but is there any others too?
it isn't that easy to search all classes from System.Windows.Media.Animation manually, and having to do it in all these similar situations.
my good old grep could do it "grep -r class.*DoubleKeyFrames" in couple of seconds.
same way i could find all classes which might also work with any other classes and functions.

if you know some other way around i have missed, i'd be more than pleased to hear of it.

[edit]

ok, i finally got that documentation app working and found somewhat decent information of inheritances.
now my only problem is to find which classes do some work together