Change name of window "Inspector"
It's just that the name of the window "inspector" doesn't seem very user friendly. I don't know what an unfamiliar user would expect to find when they click on that.
Maybe something like "Advanced Item Properties". It's a long name, but I think it would be ok. That's something that an unfamiliar user would know what to expect when they click on it.
If you think it's too long, maybe an abbreviation "Adv. Item Properties".