Using Grab from Application/Services menu

Hi
Can anyone explain how to enable Grab in the App/Services menu?
whenever I try, the three options (screen, selection, timed) are all greyed out, even though Grab itself is not. I can get the screenshot fine if I use the keyboard shortcuts, however, I don't use it a lot so I never remember what they are!
It's a pain to have to look it up everytime...
Thanks

You must invoke the Grab Service from within an application that can accept the screen shot. One that can is TextEdit. (Taking screenshots from a Service this way has never seemed practical to me.)

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