Cooldown indication, transparent rotating texture

Hi Unity fokes, I have a question.
I am currently in the middle of developing a cooldown system, for a game which utilizes an interface similar to WoW, LoL, Rift etc.

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The idea is, when an ability is used, the button becomes significant dimmer. As the ability slowly begins to cool off, the original image also slowly appears in a circular form.

I just don’t know how I should go around with this. The only thing I can figure out is, that I should probably use a transparent grey texture, but I am in doubt on how to make the original image appear in a circular shape. Maybe I am forgetting something very simple and vital.

I hope you guys can help, best regards:

  • Marc

And then you find the answer to your own question within 30min.

http://forum.unity3d.com/threads/42813-Health-Bar-UI?p=276508&viewfull=1#post276508

Sorry for bothering you.