In summary:
Tab Views, Drawers, Info-Window pages, disclosure triangles attached to
expanding/contracting windows, and probably other UI elements are all
ways
of hiding user interface elements. However, all of these ways
indicate that
more UI is available and how to see it. Tab views show the user how
many
tabs are available and the user can cycle through the tabs at any
time to
see their contents. There is usually a way for the user to open a
drawer
and see its contents.
Having a button or text field suddenly appear where there was none
before is
probably going to surprise users. There is no indication to a user
that a
hidden control exists. There is no indication to the user how to
make the
control visible or invisible. A user who remembers the existence of the
control may be come frustrated when she can not find the control later
because it is hidden and the reason for its being hidden is not obvious.
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