trayicon Visible property
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Applies to
acTrayIcon and acCaptionButton components.  

property Visible: Boolean;  

The Visible property determines whether the icon associated with acTrayIcon component is currently visible in the system tray area. Set Visible property to True if you would like to show the tray icon, or False if you would like to hide the icon.  
If you would like to make the tray icon always invisible at design-time, even if Visible property is True - disable oShowAtDesignTime option.  

See also
Options property.