How do I fade a picturebox image to another on mousehover event?

How do I animate a picturebox to change from one image to another on a mouse hover event as a fade-in effect?

I would also like to create the animated picturebox as a class that would show up under my toolbox for ease-of-use.

Example of a button with what I want to make a picturebox do. Animated Button Example-MSDN