A panel designed to hold trees of Map Layers.
Configuration properties in addition to those listed for Ext.tree.TreePanel.
Context menu (right-click) for layer nodes, for now instance of Heron.widgets.LayerNodeContextMenu. Default value is null.
Flag for showing tree lines default value is “false”.
default value is “Base Layers”. Only valid if not using the ‘hropts’ option
default value is “Overlays”. Only valid if not using the ‘hropts’ option
default value is “Layers”.