TThemedTrackBar describes the possible themable parts of a track bar.

TThemedTrackBar = (
  ttbTrackBarDontCare,
  ttbTrackBarRoot,
  ttbTrack,
  ttbTrackVert,
  ttbThumbNormal,
  ttbThumbHot,
  ttbThumbPressed,
  ttbThumbFocused,
  ttbThumbDisabled,
  ttbThumbBottomNormal,
  ttbThumbBottomHot,
  ttbThumbBottomPressed,
  ttbThumbBottomFocused,
  ttbThumbBottomDisabled,
  ttbThumbTopNormal,
  ttbThumbTopHot,
  ttbThumbTopPressed,
  ttbThumbTopFocused,
  ttbThumbTopDisabled,
  ttbThumbVertNormal,
  ttbThumbVertHot,
  ttbThumbVertPressed,
  ttbThumbVertFocused,
  ttbThumbVertDisabled,
  ttbThumbLeftNormal,
  ttbThumbLeftHot,
  ttbThumbLeftPressed,
  ttbThumbLeftFocused,
  ttbThumbLeftDisabled,
  ttbThumbRightNormal,
  ttbThumbRightHot,
  ttbThumbRightPressed,
  ttbThumbRightFocused,
  ttbThumbRightDisabled,
  ttbThumbTics,
  ttbThumbTicsVert
);

enum TThemedTrackBar {
  ttbTrackBarDontCare,
  ttbTrackBarRoot,
  ttbTrack,
  ttbTrackVert,
  ttbThumbNormal,
  ttbThumbHot,
  ttbThumbPressed,
  ttbThumbFocused,
  ttbThumbDisabled,
  ttbThumbBottomNormal,
  ttbThumbBottomHot,
  ttbThumbBottomPressed,
  ttbThumbBottomFocused,
  ttbThumbBottomDisabled,
  ttbThumbTopNormal,
  ttbThumbTopHot,
  ttbThumbTopPressed,
  ttbThumbTopFocused,
  ttbThumbTopDisabled,
  ttbThumbVertNormal,
  ttbThumbVertHot,
  ttbThumbVertPressed,
  ttbThumbVertFocused,
  ttbThumbVertDisabled,
  ttbThumbLeftNormal,
  ttbThumbLeftHot,
  ttbThumbLeftPressed,
  ttbThumbLeftFocused,
  ttbThumbLeftDisabled,
  ttbThumbRightNormal,
  ttbThumbRightHot,
  ttbThumbRightPressed,
  ttbThumbRightFocused,
  ttbThumbRightDisabled,
  ttbThumbTics,
  ttbThumbTicsVert
};