The GWT incubator contains this widget , but it does not provide a clean look, and I'm looking. The widget that I would like to use is precisely displayed on the same page: A thin resize panel with a small middle arrow that is clicked to hide / show the docked panel on the side of the page.
The widget appears on many pages of google services, which makes me suspect that it may be a common widget:
Google Reader
A slightly modified (animated) version on Maps
Someone can find or learn how to build this widget in GWT.
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