The anthem:ImageButton control works just like the anthem:Button control. Instead of having Text and TextDuringCallBack properties, the anthem:ImageButton control has ImageUrl and ImageUrlDuringCallBack properties.
anthem:ImageButton
anthem:Button
Text
TextDuringCallBack
ImageUrl
ImageUrlDuringCallBack
The image buttons in this example sleeps for two seconds in the Click handler so we can see the effect of the ImageUrlDuringCallBack property.
Click
The first two buttons are anthem:ImageButton's and the second is an asp:ImageButton so we can verify that the client coordinates are accurate.
asp:ImageButton