How can I take a screenshot while holding down the control key? I'd like to screenshot a drag operation on OSX (I'm using Mavericks). Specifically, I need to do the following:


Hold down the control key
Begin the drag
Take a screenshot
release the mouse button and control keys


The problem is, the various screen capture key combos (Command ⌘+Shift ⇧+3, etc) don't seem to trigger while the control key is held down. Is there any way around this?
Open Terminal and type the command below. From there you have 10 seconds before the screenshot is taken (you can do whatever you want or hold any keys you want in that time).

Afterwards, you can find the screenshot in the directory you executed the command.

screencapture -T 10 screenshot.jpg