How do people deal with removing unwanted code? In trying things out, clicking here and there, I get lots of auto-generated code, much of which I don't want any more, but I can't seem to get rid of it. Deleting a widget in the Frame Designer does NOT seem to remove its code, and deleting the code itself (not recommended) also does not seem to work. Do I always have to keep a backup copy to revert to after my trial-and-error experiments, so I can start from a pristine state? How do people generally do this?