Toolbars: Use Office 2003-style for toolbars
Frame: Button frame color on mouseover
Hot: (1) dropdown menu highlight; (2) menu button top gradient; (3) menu button bottom gradient
Push: (1) button top gradient (when pushed); (2) button bottom gradient (when pushed)
Checkmark: (1) button color (when activated); (2) dropdown menu button color (when activated)
Gradient: (1) dropdown menu left gradient (when displayed); (2) dropdown menu right gradient
Grip: toolbar grip color when toolbar unlocked
Also check this thread: Toggle Buttons and Button Color Issue