trayicon ImageIndex property
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Applies to
acTrayIcon and acAppEvents components.  

property ImageIndex: Integer;  

The ImageIndex property specifies the index of image from ImageList property, to display specified image as tray icon. The ImageIndex property used only if TImageList component assigned to ImageList property.  
If you're using the animated icons (see Animate property), the ImageIndex will increased every time after the expiration of interval specified in AnimateInterval property.  

See also
Animate and ImageList properties.