I just realize that the metacity theme (window decorator) from Gnome Cupertino did not applied when I use it, even though the theme maker already include metacity theme in his release.
This is because Gnome Shell 3.6 Bugs or they're changed without notice. The .themes folder that placed under user's home will not read by the system, so it will not change your window decorator theme.
Solution 1: we need to move those package to the system wide's themes folder; /usr/share/themes/
i.e.: /usr/share/themes/GnomeCupertino
Solution 2: make a themes folder under ~/.local/share/ then move that theme into this folder
i.e.: ~/.local/share/themes/GnomeCupertino
Note: With this solution the themes in this folder will not appear in the Gnome tweak tools.
Solution 3: make a symbolic link from ~/.themes to the ~/.local/share/
$ln -s ~/.themes ~/.local/share/themes
- Use the Gnome Tweak tools to select the theme you want
- Alt+F2 put r then Enter to refresh the changed.
PS: Use Gnome Cupertino (gtk theme) with Zukitwo cupertino (gnome shell theme) is ROCK! ;)
Reference: http://www.fandigital.com/2012/10/use-custom-theme-in-gnome-shell-36.html