Overlay/Fast Access Button/Menu

I remember having found a Vaadin addon a few month ago which enables you to add components/menus in a way that they are always visible.
I cannot find it anymore or I must have been dreaming.
The Overlays addon heads into that direction, the sample app I remember was way richer.
What I want is to add a logout button to my application, and a few others. They should be visible all time, just like the “Pro Support” button in this Vaadin forum on the left side.

Does that ring a bell for someone?
Does anyone know of the addon I described?
Help would be very kind of you.