this is not a reply to your specific question, though i hope this will be useful for you
to my sense, i understand that you have tried to crop the Event Properties box from the background, didnt ya? i guess you print screen the desktop and edited the picture. if u did so, i got a better way. press ALT + PRINT SCREEN when the Event Properties opened and active. by that you will get a screenshot ONLY on the Even Properties.
hope this will be useful for your ease.