public virtual int Add(MenuItem item)
{
if (item.Parent != null)
{
item.Parent.MenuItems.Remove(item);
}
items.Add(item);
item.Index = items.Count - 1;
UpdateItem(item);
owner.OnMenuChanged(EventArgs.Empty);
if (owner.parent_menu != null)
{
owner.parent_menu.OnMenuChanged(EventArgs.Empty);
}
return(items.Count - 1);
}