8.10 Gadgets that can have children

Most gadgets cannot have any children associated with them; they are leaf elements in the sheet hierarchy. However, a number of specialized gadgets exist which can take children. This section describes those classes.

For all the classes described in this section, the children of any instance of the class are defined using the children: init-keyword. In addition, the children of an instance of any of these classes must themselves be gadgets of some kind. In some cases (menu bars, for instance), the type of gadgets that can be defined as a child is constrained.

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Functional Developer Library Reference: DUIM - 3 Dec 1998