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OL3-ext: control bar

ol.control.Bar is a panel that contains other controls. Control bar can be nested.
You can choose the position for the control bar.
It can group ol.control.Toggle with a toggleOne propertie to have only one activated at a time. You can compose toolbars with it.
A sub-bar can be nested to add options/controls visible when the parent ol.control.Toggle is active (see the sub-bar example).