Widgets and Controls

This section outlines the various widgets and controls that are defined in XUL. It does not attempt to cover the basic layout containers (box, stack, grid and popup), nor does it attempt to cover the specialized document root containers (window, wizard, dialog, page and overlay). Layout is covered in section 2, and the root elements are covered in section 4.

http://www.mozilla.org/projects/xul/widgets.html