captionbutton AllowPress property
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Applies to
acCaptionButton component and other components that uses TacCustomCaptionButton as ancestor class - acAppAutoRun, acTrayIcon, acFormHelp, acFormTopmost, acFormRoller.  

property AllowPress: Boolean;  

The AllowPress property controls whether CaptionButton could be pressed (if button pressed, Down property will be True).  
If AllowPress is True, the button will have two states - pressed and unpressed (up and down state), which can be controlled by Down property. Also two additional events will occurs - OnPressed on button pressing and OnReleased on releasing.  

See also
Down property and OnClick, OnPressed, OnReleased events.