Tree Tree and TreeNode classes handle both data and view Controllers TreeBasicController Controller that provides all capabilities but no server calls TreeLoadingController Added dynamic node loading from server TreeRPCController All actions call server Selector TreeSelector handles node selection. Currently, only single node can be selected Drag'n'Drop TreeDragSource, TreeDropTarget and TreeDNDController are classes that allow nodes to be dragged, to be dropped on and mechanism binding that together. Sources are located under src/dnd folder, not among widgets. Context menu TreeContextMenu inherits dojo context menu to provide a lightweight right-click menu. There is a single menu object for all nodes, although it always knows its target Style & icons Tree.css and icons are located under src/widget/templates and provide basic style used by default. Extensions TreeControllerExtension contains additional functions for controller that you might need