In typical usage, the client instantiates this class with a particular wizard. The dialog serves as the wizard container and orchestrates the presentation of its pages.
The standard layout is roughly as follows: it has an area at the top containing both the wizard's title, description, and image; the actual wizard page appears in the middle; below that is a progress indicator (which is made visible if needed); and at the bottom of the page is message line and a button bar containing Help, Next, Back, Finish, and Cancel buttons (or some subset).
Clients may subclass WizardDialog, although this is rarely required.
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