Swaps child nodes of the given node instance.
IndexA and IndexB are zero based and relative to the parent node. That is the first child node of the parent node is number zero.
The Swap method may trigger redraw. If doing many swaps in one round then use the LockDrawing property to prevent redraw between swaps.
The Swap method is a lot faster when used on nodes that do not live within the scope of the screen vector. (Nodes that are within expanded scope are in the screen vector). When Swap is used on a node that is within the scope of the screen vector then linear lookups are performed.