public function nextNodeSibling($nID)
    {
        //if ($nID == $this->tree->TreeLastPage) return -37;
        if (!$this->hasNode($nID) || $this->allNodes[$nID]->parentID <= 0) {
            return -3;
        }
        $nodeOverride = $this->moveNextOverride($nID);
        if ($nodeOverride > 0) {
            return $nodeOverride;
        }
        $nextSibling = SLNode::where('NodeTree', $this->treeID)
            ->where('NodeParentID', $this->allNodes[$nID]->parentID)
            ->where('NodeParentOrder', (1+$this->allNodes[$nID]->parentOrd))
            ->select('NodeID')
            ->first();
        if ($nextSibling && isset($nextSibling->NodeID)) {
            return $nextSibling->NodeID;
        }
        return $this->nextNodeSibling($this->allNodes[$nID]->parentID);
    }