Help setting up Mob Capture for 1.8

[Liaison]

A little background here if my programing is far off i am fairly new to modding Minecraft, and decided to learn the new 1.8 that being said i dont know if i just have a wrong nbt code but when i try to "Capture" or store data from a mob in an item it doesnt work but will work for Blocks

 

Here is my code

ItemProperties

http://pastebin.com/vEnBnZf0

Any help would be greatly appreciated

And yes the items name is PokeBall while testing, Cause lets face it they do the same thing. XP

[Liaison]

Sorry i should have put in notes those are the lines of my sorry attempt to capture mobs though im afraid i simply don't know the calls well enough for minecraft if you could give me a call line i will find a way to make it work that is all i am asking for here not the full code i know that stuff takes time an i wouldnt want to waste anyones