addRightItem method
Add Right Item
Implementation
@override
void addRightItem(IMindMapNode item) {
_rightItems.add(item);
item.setParentNode(this);
item.setNodeType(NodeType.right);
refresh();
///if (getNodeType() == NodeType.root && _rightItems.length == 1) {
getMindMap()?.refresh();
///}
///getMindMap()?.refresh();
getMindMap()?.onChanged();
}