Unity Animated Gif on Editor Window

Hi All Memebers,

I need to show an animated image of downloading on Editor Window. The download image is like dotted circle.
I tried to use System.Drawing and System.drawing.Imaging. Although Mono supports it Unity doesn’t support it. I tried to get System.Drawing.dll and copy into Asstes or Assets/Editor but it didn’t work. It gives me below mentioned error.

Internal compiler error. See the console log for more information. output was:
Unhandled Exception: System.Reflection.ReflectionTypeLoadException: The classes in the module cannot be loaded.

Could somebody please provide me a method how to get this animated gif on Editor window? I want to call this on onGUI function.

Thanks & regards,

Google search is your friend: http://forum.unity3d.com/threads/animated-gifs.10126/