Spawning wither automatically and removing the boss bar

I was wondering how to remove the bossbar that shows up at the top of the screen when a wither is spawned.
Also, is it possible to make the wither spawn automatically? As many of you may know, when spawned. the wither turns white and after a few seconds, it explodes and summons the wither. Is it possible to skip that tedious transformation and automatically spawn the fully developed wither?

 

@EpicCraft21 Its not possible to remove the boss bar since its normally client side. Thats why normal servers actually need to spawn a wither or enderdragon to display the bossbar.

 

Doesn't BarAPI give the ability to remove it?

 

@EpicCraft21 Yeah. Despawning the wither/enderdragon removes it

 

Guess that isnt an option though . How do I skip the transformation thing though?

 

@EpicCraft21 The bossbar is client side. So you will never be able to do this in 1.8, Only in Mods.