appevents ImageIndex property
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Applies to
acAppEvents and acTrayIcon components.  

property ImageIndex: Integer;  

The ImageIndex property specifies the index of image from the ImageList property, displayed on task button. The ImageIndex property used only if TImageList component assigned to ImageList property.  
If you're using the animated icons (see AnimateIcon property), the ImageIndex will increased every time after the expiration of interval specified in AnimateInterval property.  

See also
AnimateIcon and ImageList properties.