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A panel is an instance of the class wx.Panel, and is a
simple container for other widgets with little functionality of its own. You should
almost always use a wx.Panel as the top-level subwidget of your frame. For one
thing, the extra level can allow greater code reuse, as the same panel and layout
could be used in more than one frame. Using a wx.Panel gives you some of the
functionality of a dialog box within the frame. This functionality manifests itself
in a couple of ways. One is simply that wx.Panel instances have a different default
background color under MS Windows operating systems—white, instead of gray.
Secondly, panels can have a default item that is automatically activated when the
Enter key is pressed, and panels respond to keyboard events to tab through the items
or select the default item in much the same way that a dialog does.