trayicon Visible property
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Applies to
acAppAutoRun, acTrayIcon, acFormHelp, acFormTopmost, acFormRoller components as subproperty of CaptionButton.  

property Visible: Boolean;  

The Visible property determines whether the caption button currently visible on the title bar. Make Visible property True if you would like to show the button on title bar, or False if you would like to hide the button.  
tip When you changing the Visible property, placements of others button will automacially recalculated and other buttons with higher BtnOrder will be shifted to the right side of the title bar, filling the empty space.  

See also
Enabled property of CaptionButton and acCaptionButton component.