The Left property has effect only for assistant nodes. Use the AddAssistant method to add assistant nodes. Use the IsAssistant property to determine whether a node is an assistant node or a child node. Use the Assistant property to access the assistant nodes collection. Use the RemoveAssistant  method to remove an assistant node. Use the Caption property to change the node's caption at runtime. Please notice that the assistant node is always aligned to the right, no matter of the Left property, if is a child of a node that has the ArrangeSiblingNodesAs property on exTree.