The Skitch app by Evernote in the Mac App Store is severely under-featured compared to the original version that was first released in 2010.
The other piece of good news is that Skitch 1.0.12 works flawlessly in OS X 10.9 Mavericks on the Mac.
I had wanted to do a timed (delayed) capture of an iTunes Radio window without the overlay information bars that appear when you float your mouse pointer over the window.
To perform a timed application window capture in Skitch Plus, simply hold down the
Shift key and click anywhere in the window of interest.