Looking at the screenshot, it looks like they are trying to manipulate a copy of AI2Ofline. A compiled version of App Inventor is very different from its original source. You'd likely be much better served manipulating the sources themselves rather than hacking changes onto AI2Offline.
@ewpattonNo no sir we intend not to do anything bad.Due to showing App Inventor Build Error I'm only here in some try.I have no intention of hacking this AI2 just to use it myself.I just want to see my own builder in a different way.Of course I wouldn't do this a second time if editing AI2 was wrong. Thank you sir for your important feedback
@preetvadaliyaHonestly thank you so much I never thought anyone would show me so beautifully.Thank you very much.I wish you all the best. Thank you very much