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Like imageclass, applications do not normally create objects of
gadgetclass, but instead create objects of its subclasses. Currently,
gadgetclass has four subclasses:

    An easy to implement, horizontal or vertical proportional gadget.

    A string gadget.

    A special gadget class that creates one composite gadget out of
    several others.

    A button gadget that keeps sending button presses while the user
    holds it down.

buttongclass has a subclass of its own:

    A buttongclass gadget that outlines its imagery with a frame.

For specific information on these classes, see the Boopsi Class Reference
in the Appendix B of this manual.