Ext.Net.PanelDesigner.TogglePanel C# (CSharp) Method

        private void TogglePanel()
        {
            Panel panel = (Panel) this.Control;

            PropertyDescriptor collapsed = TypeDescriptor.GetProperties(panel)["Collapsed"];
            bool value = (bool) collapsed.GetValue(panel);
            collapsed.SetValue(panel, !value);
            panel.Collapsed = !value;
        }