Why Scene view don't show anything but game view is ok with NGUI ?

I open NGUI example 1 and scene view don’t show anything, but game view is ok, how I fix it ?. I use unity 4.5.1f3 and NGui 3.6.7.
Thanks for help.

1.Disable “Main Camera” or delete it.

2.Select “UI Root/Camera” change property “Culling Mask” in Component to “Everything”