Content Assist problem in eclipse 3.5 (solved)

Question

I've got a Content Assist problem in eclipse 3.5, which is eclipse-java-galileo-win32.zip.

When I press Alt+/(I've changed Ctrl+Space to this) in Java Editor, no assistant tips are shown up.

I've solved this problem and I'd like to share my experience.

1. Eclipse-->Preferences-->General-->Keys;
2. Search 'Content Assist';
3. You'll find that in 'When' Field, the default value is 'in dialogs and window'
4. Change the value to 'Editing Java Source', then press 'OK' to save;

I can not post a image, but here is a link:

1. http://www.freeimagehosting.net/image.php?e0987ea847.png

That's All.