Depends what you'd call "hooks". In terms of the Windows API there are some really cool really useful dynamic features in the toolkit, but they're obviously borderline virus/malware type functions. (IE read the text of the entire window if you have a WID).

Stuff like that is standard to any toolkit. However what you may be talking about is that bullshit they call the Windows directory and Windows Protective Service where it doesn't let you modify it directly but it's easily modified programmatically.