Symptom
The Window command in the Capture menu of Grab appears dimmed or unavailable.
Figure 1 Window command dimmed
Solution
The Window command does not work. You may use this workaround:
1. Choose the Timed Screen command from the Capture menu.
2. Click Start Timer.
3. Arrange windows or menus for your screen shot.
4. Save the resulting image file.
5. Use an image editor application to crop the picture as you wish.