Adds a castbar to the "Compact" visual style in ag_unitframes.
How to install: Must have ag_unitframes (http://www.curse.com/downloads/details/9005/) installed. navigate to Program Files\World of Warcraft\Interface\AddOns\ag_UnitFrames\layouts and replace the existing Compact.lua file with the one provided. It may be smart to make a backup of the original Compact.lua just in case you find this replacement unsatisfactory.
All credit to the creator of ag_unitframes-- I merely edited the .lua file in order to use the castbar feature on the compact visual style, which wasn't possible with the original version.