public RadForm1()
        {
            InitializeComponent(); 

            for (int i = 0; i < 20; i++)
            {
                this.radListControl1.Items.Add("Item" + i);
            }

            this.radListControl1.EnableAlternatingItemColor = true;
            this.radListControl1.SelectionMode = SelectionMode.MultiSimple;
        }

        private void radButton1_Click(object sender, EventArgs e)
        {
            this.radListControl1.SelectAll();
        }

            this.radListControl1.SelectAll();
            DefaultListControlStackContainer viewElement = this.radListControl1.ListElement.ViewElement as DefaultListControlStackContainer;
            if (viewElement != null)
            {
                viewElement.ForceVisualStateUpdate();
            }
        }