TVItemParent[Node] - returns the parent node for the given one;

TVItemNext[Node] is the next sibling node in the tree after Node (a child for the same parent). Returns 0 if Node is the most recent child in the same parent;

TVItemPrevious[Node] is the previous node in the tree. Returns 0 if Node is the first top-level node;

TVItemNextVisible[Node] - the next node displayed in the window;

TVItemPreviousVisible[Node] - the previous element displayed in the tree window;

TVItemVisible[Node] - Checks if a node is "visible", in the sense that all its parents in the tree hierarchy are open. By setting this property to True, it is possible to ensure the "visibility" of the node (all of its unrevealed parents are opened at the same time);