You may use the following constants of type ThemeTrackKind to identify specific kinds of track-based controls to the Appearance Manager. The ThemeTrackKind constants are available with Appearance Manager 1.1 and later.
enum {
kThemeScrollBar = 0,
kThemeSmallScrollBar = 1,
kThemeSlider = 2,
kThemeProgressBar = 3,
kThemeIndeterminateBar = 4
};
typedef UInt16 ThemeTrackKind;