Need Minecraft Java Class help!

Hello I am trying to program my own version of minecraft, I decompiled the 1.9 jar version file. One thing i really need to do is get rid of the Player Preview in the inventory. The only problem with this is that I have no idea which Class is responsible for the preview as they are just labeled as "a" or "dc" and just a crud load of other random letter combinations. Would anyone be able to tell me which class this portion of the game can be found in. Also if there is an easier way of eliminating the Player Preview Please let me know as it would make my life easier.