Shortcuts in ZBrush

[ywu12]

In my ZBrush, I assigned different numbers for different brushes (1 for move, 2 for clay strip, etc.). On the Space Mouse side, I assigned "button 1" to "keystroke 1" but when I pressed button 1 on the Space Mouse, I didn't get my move brush. Is there anything that I missed? I did roughly the same thing for Blender, and I had no problem (by pressing button 1 on the Space Mouse, I got my grab brush in Blender). Your insight will be much appreciated. Thanks.