theming images from assistive touch feature problem

[Star784]

i wanted to see if the images from the new ios5 feature assistive touch feature were themable. I looked in ifile and found the dirctory of it in System/Library/CoreServices/AssistiveTouch.app. I thought at first it was themeable because it is in the same folder as Springboard.app is. So i made a theme(mytheme/Folders/AssistiveTouch.app in var/stash/Themes) and put the images that would modify the original. But it didnt work. did i do something wrong? or it isnt themable?? I dont wanna manually do it because its a headache..