A layer container that will collect all overlay layers of an OpenLayers map. Only layers that have displayInLayerSwitcher set to true will be included. The childrens’ iconCls defaults to “gx-tree-layer-icon” and this node’ text defaults to “Overlays”.
To use this node type in TreePanel config, set nodeType to “gx_overlaylayercontainer”.
Configuration properties in addition to those listed for Ext.tree.AsyncTreeNode.