TThemedPage describes the possible themable parts of a tab page.

TThemedPage = (
  tpPageDontCare,
  tpPageRoot,
  tpUpNormal,
  tpUpHot,
  tpUpPressed,
  tpUpDisabled,
  tpDownNormal,
  tpDownHot,
  tpDownPressed,
  tpDownDisabled,
  tpUpHorzNormal,
  tpUpHorzHot,
  tpUpHorzPressed,
  tpUpHorzDisabled,
  tpDownHorzNormal,
  tpDownHorzHot,
  tpDownHorzPressed,
  tpDownHorzDisabled
);

enum TThemedPage {
  tpPageDontCare,
  tpPageRoot,
  tpUpNormal,
  tpUpHot,
  tpUpPressed,
  tpUpDisabled,
  tpDownNormal,
  tpDownHot,
  tpDownPressed,
  tpDownDisabled,
  tpUpHorzNormal,
  tpUpHorzHot,
  tpUpHorzPressed,
  tpUpHorzDisabled,
  tpDownHorzNormal,
  tpDownHorzHot,
  tpDownHorzPressed,
  tpDownHorzDisabled
};