Change button layout of Clearlooks-Phenix theme in XFCE

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http://askubuntu.com – I want to use Clearlooks window theme in XFCE like in Gnome, so I chose Clearlooks-Phenix, but the option to customize the button layout (close, maximize, minimize) is grayed-out. I edited index.theme, but it doesn't help. How to move the buttons to the left? I want it to be like close, maximize, minimize, title in the middle, always on top, shade, menu icon (HowTos)