The System.Windows.Forms.TreeNode that was added to the collection.
The TreeNode.Name property corresponds to the key for a System.Windows.Forms.TreeNode in the System.Windows.Forms.TreeNodeCollection.
The tree node is added to the end of the collection. You can also add new System.Windows.Forms.TreeNode objects to the collection by using the TreeNodeCollection.AddRange(TreeNode[]) or erload:System.Windows.Forms.TreeNodeCollection.Insert methods.
The imageKey parameter refers to an image in the TreeView.ImageList property of the parent System.Windows.Forms.TreeView.