the Map this control will be added to
The control's container element. This should be created by the control and returned by onAdd without being attached to the DOM: the map will insert the control's element into the DOM as necessary.
Unregister a control on the map and give it a chance to detach event listeners and resources. This method is called by Map.removeControl internally.
Register a control on the map and give it a chance to register event listeners and resources. This method is called by Map.addControl internally.