Button padding is working only on default theme! On other themes when the active window is small there is no padding!
YouTube Video: http://www.youtube.com/watch?v=4aY8GyyjuM8
Here lies the answer:
A lot of Ubuntu users requested this guide, because the new Ubuntu 11.10 operating system doesn't provide a tool to add new GTK or icon themes. Why? Because of the GNOME 3 desktop.
How to Install GNOME Themes in Ubuntu 11.10