I have a toolbar with 10 buttons the player can click on to “cast a spell”. But how to make the effect on button where its like a timer. The effect is seen in WoW and other MMORPG.
Im using Texture2D for buttons.
It’s difficult to understand or imagine what exactly do you mean.
Is it something like this?
Its like the buttons in the actionbar in the bottom of the screen. I dont know what its called 
Yes, thanks, it’s became clearer now. I think the technique described here (Creating a Circular Progressbar / Timer - Questions & Answers - Unity Discussions) could helps you.
Here is one more discussion about this approach: http://forum.unity3d.com/threads/42813-Health-Bar-UI.
Ah thank you