Extending/embedding DialogBox

I am a little confused over the best practice use of DialogBox when
using UIBinders.

In UIBinder xml, you can include a DialogBox element, and configure it
using, say, the caption element or text attributes. This seems to hint
that you can embed a full DialogBox definition, letting a widget carry
its own DialogBox to pop on demand.
However, doing so results in the dialog box being shown as part of the
page on load, and some comments seem to indicate that "you're not
supposed to do this".

If, on the other hand, you extend DialogBox as its own stand-alone
widget, you only get to define the *contents* of the dialog box in the
ui.xml, forcing you to set things like caption and glass pane in the
Java code, which seems to defy the purpose of a uibinder in the first
place.

What am I missing?

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