this.addItemToNode(node, newItem);
this.addItemToNode(node, newItem, parentGroup);
    private void newItem(){        this.saveData();        if(this.currentContainer == null)            return;        DefaultMutableTreeNode node = null;                ArmylistWargearItem newItem = new ArmylistWargearItem("no name", this.armylistArmy);                ArmylistWargearGroup parentGroup = null;        if(this.currentContainer.getGroup() != null){            parentGroup = this.currentContainer.getGroup();            node = this.currentContainer.getNode();        }        if(parentGroup == null && this.currentContainer.getItemGroup() != null){            parentGroup = this.currentContainer.getItemGroup();            node = this.currentContainer.getParent();        }        if(parentGroup == null)            return;                parentGroup.addItem(newItem);                this.addItemToNode(node, newItem);                this.wargearTree.updateUI();            }