Custom created abilities for custom class

I have created a custom class called BloodMage, which has items that use a custom Activate ability (called LifeDrain) that I wrote. Everything works properly, with the exception that the Ability item tooltip does not display the custom ability. Does anyone have any thoughts on this? Do I need to modify the client side? The ability triggers perfectly, just the text does not show up on the item. Thanks!

It's the server side. Did you do everything like you were suppose to. Please put screenshots and post your code up for us to see