See 
http://code.google.com/webtoolkit/doc/latest/DevGuideUiPanels.html#Recipes 
"Using 
a LayoutPanel without RootLayoutPanel"
See also 
http://code.google.com/intl/fr-FR/webtoolkit/doc/latest/DevGuideUiPanels.html#Resize
 which 
says "The purpose of these two interfaces is to form an unbroken hierarchy 
between all widgets that implement RequiresResize and the RootLayoutPanel, 
which listens for any changes (such as the browser window resizing) that 
could affect the size of widgets in the hierarchy."
(note that there's a link from the RootLayoutPanel description in the same 
doc: "This panel is a singleton that serves as a root container to which all 
other layout panels should be attached (see RequiresResize and 
ProvidesResize below for details)")
So it really *is* documented.

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