Only system colors will be themed. Controls with fixed colors such as clBlue, clBlack, $$00FCFCFC will not be themed.
The following colors are themed: clWindow, clWindowText, clBtnFace, clHighlight, clHighlightText, cl3DLight, clGrayText, clBtnShadow, clWindowFrame and Explorer colors of TImageEnMView
// Compare the following... IEGlobalSettings().EnableTheming := True; ImageEnView1.Background := clBtnFace; // Background will be a themed color ImageEnView1.Background := clBlue; // Background will be blue
IEGlobalSettings().EnableTheming := False; ImageEnView1.Background := clBtnFace; // Background will be clBtnFace (gray) ImageEnView1.Background := clBlue; // Background will be blue