public void AddItem(string text, bool closeOnSelection, SelectionItem.EntrySelectedHandler selectionHandler)
        {
            var item = new SelectionItem(text, closeOnSelection);
            if(selectionHandler!=null)
                item.EntrySelected += selectionHandler;

            AddItem(item);
        }
 public void AddItem(SelectionItem item)
 {
     items.Add(item);
 }