TThemedWindow describes the possible themable parts of a window.

TThemedWindow = (
  twWindowDontCare,
  twWindowRoot,
  twCaptionActive,
  twCaptionInactive,
  twCaptionDisabled,
  twSmallCaptionActive,
  twSmallCaptionInactive,
  twSmallCaptionDisabled,
  twMinCaptionActive,
  twMinCaptionInactive,
  twMinCaptionDisabled,
  twSmallMinCaptionActive,
  twSmallMinCaptionInactive,
  twSmallMinCaptionDisabled,
  twMaxCaptionActive,
  twMaxCaptionInactive,
  twMaxCaptionDisabled,
  twSmallMaxCaptionActive,
  twSmallMaxCaptionInactive,
  twSmallMaxCaptionDisabled,
  twFrameLeftActive,
  twFrameLeftInactive,
  twFrameRightActive,
  twFrameRightInactive,
  twFrameBottomActive,
  twFrameBottomInactive,
  twSmallFrameLeftActive,
  twSmallFrameLeftInactive,
  twSmallFrameRightActive,
  twSmallFrameRightInactive,
  twSmallFrameBottomActive,
  twSmallFrameBottomInactive,
  twSysButtonNormal,
  twSysButtonHot,
  twSysButtonPushed,
  twSysButtonDisabled,
  twMDISysButtonNormal,
  twMDISysButtonHot,
  twMDISysButtonPushed,
  twMDISysButtonDisabled,
  twMinButtonNormal,
  twMinButtonHot,
  twMinButtonPushed,
  twMinButtonDisabled,
  twMDIMinButtonNormal,
  twMDIMinButtonHot,
  twMDIMinButtonPushed,
  twMDIMinButtonDisabled,
  twMaxButtonNormal,
  twMaxButtonHot,
  twMaxButtonPushed,
  twMaxButtonDisabled,
  twCloseButtonNormal,
  twCloseButtonHot,
  twCloseButtonPushed,
  twCloseButtonDisabled,
  twSmallCloseButtonNormal,
  twSmallCloseButtonHot,
  twSmallCloseButtonPushed,
  twSmallCloseButtonDisabled,
  twMDICloseButtonNormal,
  twMDICloseButtonHot,
  twMDICloseButtonPushed,
  twMDICloseButtonDisabled,
  twRestoreButtonNormal,
  twRestoreButtonHot,
  twRestoreButtonPushed,
  twRestoreButtonDisabled,
  twMDIRestoreButtonNormal,
  twMDIRestoreButtonHot,
  twMDIRestoreButtonPushed,
  twMDIRestoreButtonDisabled,
  twHelpButtonNormal,
  twHelpButtonHot,
  twHelpButtonPushed,
  twHelpButtonDisabled,
  twMDIHelpButtonNormal,
  twMDIHelpButtonHot,
  twMDIHelpButtonPushed,
  twMDIHelpButtonDisabled,
  twHorzScrollNormal,
  twHorzScrollHot,
  twHorzScrollPushed,
  twHorzScrollDisabled,
  twHorzThumbNormal,
  twHorzThumbHot,
  twHorzThumbPushed,
  twHorzThumbDisabled,
  twVertScrollNormal,
  twVertScrollHot,
  twVertScrollPushed,
  twVertScrollDisabled,
  twVertThumbNormal,
  twVertThumbHot,
  twVertThumbPushed,
  twVertThumbDisabled,
  twDialog,
  twCaptionSizingTemplate,
  twSmallCaptionSizingTemplate,
  twFrameLeftSizingTemplate,
  twSmallFrameLeftSizingTemplate,
  twFrameRightSizingTemplate,
  twSmallFrameRightSizingTemplate,
  twFrameBottomSizingTemplate,
  twSmallFrameBottomSizingTemplate
);

enum TThemedWindow {
  twWindowDontCare,
  twWindowRoot,
  twCaptionActive,
  twCaptionInactive,
  twCaptionDisabled,
  twSmallCaptionActive,
  twSmallCaptionInactive,
  twSmallCaptionDisabled,
  twMinCaptionActive,
  twMinCaptionInactive,
  twMinCaptionDisabled,
  twSmallMinCaptionActive,
  twSmallMinCaptionInactive,
  twSmallMinCaptionDisabled,
  twMaxCaptionActive,
  twMaxCaptionInactive,
  twMaxCaptionDisabled,
  twSmallMaxCaptionActive,
  twSmallMaxCaptionInactive,
  twSmallMaxCaptionDisabled,
  twFrameLeftActive,
  twFrameLeftInactive,
  twFrameRightActive,
  twFrameRightInactive,
  twFrameBottomActive,
  twFrameBottomInactive,
  twSmallFrameLeftActive,
  twSmallFrameLeftInactive,
  twSmallFrameRightActive,
  twSmallFrameRightInactive,
  twSmallFrameBottomActive,
  twSmallFrameBottomInactive,
  twSysButtonNormal,
  twSysButtonHot,
  twSysButtonPushed,
  twSysButtonDisabled,
  twMDISysButtonNormal,
  twMDISysButtonHot,
  twMDISysButtonPushed,
  twMDISysButtonDisabled,
  twMinButtonNormal,
  twMinButtonHot,
  twMinButtonPushed,
  twMinButtonDisabled,
  twMDIMinButtonNormal,
  twMDIMinButtonHot,
  twMDIMinButtonPushed,
  twMDIMinButtonDisabled,
  twMaxButtonNormal,
  twMaxButtonHot,
  twMaxButtonPushed,
  twMaxButtonDisabled,
  twCloseButtonNormal,
  twCloseButtonHot,
  twCloseButtonPushed,
  twCloseButtonDisabled,
  twSmallCloseButtonNormal,
  twSmallCloseButtonHot,
  twSmallCloseButtonPushed,
  twSmallCloseButtonDisabled,
  twMDICloseButtonNormal,
  twMDICloseButtonHot,
  twMDICloseButtonPushed,
  twMDICloseButtonDisabled,
  twRestoreButtonNormal,
  twRestoreButtonHot,
  twRestoreButtonPushed,
  twRestoreButtonDisabled,
  twMDIRestoreButtonNormal,
  twMDIRestoreButtonHot,
  twMDIRestoreButtonPushed,
  twMDIRestoreButtonDisabled,
  twHelpButtonNormal,
  twHelpButtonHot,
  twHelpButtonPushed,
  twHelpButtonDisabled,
  twMDIHelpButtonNormal,
  twMDIHelpButtonHot,
  twMDIHelpButtonPushed,
  twMDIHelpButtonDisabled,
  twHorzScrollNormal,
  twHorzScrollHot,
  twHorzScrollPushed,
  twHorzScrollDisabled,
  twHorzThumbNormal,
  twHorzThumbHot,
  twHorzThumbPushed,
  twHorzThumbDisabled,
  twVertScrollNormal,
  twVertScrollHot,
  twVertScrollPushed,
  twVertScrollDisabled,
  twVertThumbNormal,
  twVertThumbHot,
  twVertThumbPushed,
  twVertThumbDisabled,
  twDialog,
  twCaptionSizingTemplate,
  twSmallCaptionSizingTemplate,
  twFrameLeftSizingTemplate,
  twSmallFrameLeftSizingTemplate,
  twFrameRightSizingTemplate,
  twSmallFrameRightSizingTemplate,
  twFrameBottomSizingTemplate,
  twSmallFrameBottomSizingTemplate
};