class ItemGroup extends AbstractItemHierarchy implements ItemInflater.ItemParent,
        ItemHierarchy.Observer {

    @Override
    public ItemHierarchy findItemById(int id) {
        if (id == getId()) {
            return this;
        }
        for (ItemHierarchy child : mChildren) {
            ItemHierarchy childFindItem = child.findItemById(id);
            if (childFindItem != null) {
                return childFindItem;
            }
        }
        return null;
    }

    public  ItemGroup();
    public  ItemGroup(Context context, AttributeSet attrs);

}