some problem with emacs+slime

[anranyicheng]

Hi,
My environment : emacs+slime+win10 + sbcl-2.0, and I download the latest cl-cffi-gtk from github.
When I run demo in Windows PowerShell, the demo can run immediately:
* (ql:quickload :gtk-demo)
* (in-package :gtk-demo)
* (demo-grid) ;; or (demo-box),(demo-frame), and so on.
But, when I run demo with emacs+slime, the demo is running ,but can not find the appcation window, then I enter the demo again, it is ok. some one can help me?

CL-USER> (ql:quickload :gtk-demo)
To load "gtk-demo":
Load 1 ASDF system:
gtk-demo
; Loading "gtk-demo"

(:GTK-DEMO)
CL-USER> (in-package :gtk-demo)
#<PACKAGE "GTK-DEMO">
GTK-DEMO> (demo-box)
#<SB-THREAD:THREAD "cl-cffi-gtk main thread" RUNNING {10075C5443}>
1
GTK-DEMO> (demo-box)
#<SB-THREAD:THREAD "cl-cffi-gtk main thread" RUNNING {10075C5443}>
2
GTK-DEMO>

Thanks!