Class description A button is a gadget which responds to mouse clicks by invoking a quotation.
A button's appearance can vary depending on the state of the mouse button if the interior or boundary slots are set to instances of button-pen.
A button can be selected, which is distinct from being pressed. This state is held in the selected? slot, and is used by checkbox instances to render themselves when they're checked.
A button can optionally display a message in the window's status bar whenever the mouse cursor hovers over the button. To enable this behavior, just set a string to the button's tooltip slot.