4.4. Extending a panel
Panels are a subclass of widgets. This means you can use the same technique to extend panels as you’ve seen for widgets. But we need to make a distinction between widgets and panels: panels have a set of methods that allow you to add and remove other widgets. If you extend a panel, then your new widget inherits those panel-specific methods.
You should only extend a panel if you want the result to look, feel, and act like a panel. This might sound obvious, but extending a panel means a developer can easily add new widgets to it by calling the add(Widget w) method.
If you’re trying to create a new widget that’s really a panel holding a determined set of other widgets, then you should ...
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