By default, objects in a custom view tree appear in the order in which you added them. Use items in this dialog box to arrange the order of objects in a custom view:
Nodes—Displays objects that you have added to the custom view.
Move Up—Moves the selected object up one place in the custom view tree.
Move Down—Moves the selected object down one place in the custom view tree.
You can only arrange nodes that are directly under the root node.