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.
Down property and OnClick, OnPressed, OnReleased events.