Declaration
TIEUpdateReason = (ieurDefault, // Default value (always reset to this during Update call)
ieurScrolled, // Control was scrolled (TImageEnView)
ieurZoomed, // Control was zoomed (TImageEnView)
ieurSelectionChanged, // Selection made within control (TImageEnView)
ieurComponentStuffChanged, // Internal/property changes
ieurImageEdited, // Update from within TImageEnProc
ieurIO // Update from within TImageEnIO, TImageEnMIO
);