how to make specific icon on top?

[4521312]

Hello,

Here's the situation:
I'm using TidyBar and EarlyFrost
I want the EarlyFrost addon's icon (on screenshot seen to the left on main action bar, partially hidden.) to be on top of my frostbolt, but as shown it'll be hidden by the action bar.

Here's the screenshot:
http://imageshack.us/photo/my-images/824/actionbar.jpg/

My solution would be to modify the EarlyFrost addon code with a "Always on top" sort of function, but I have been unable to find said function.

Any ideas? I'd like to learn how the game decides what is on top.