public IEnumerable<object> Render(PanelItem panelItem)
{
var dropDownList = new DropDownList { ID = panelItem.GetId(), Enabled = panelItem.Editable, Width = new Unit(panelItem.Width, UnitType.Ex), Visible = panelItem.Visible };
dropDownList
.AddStyle(CssClass.Item)
.AttachToolTip(panelItem)
.ToggleStyle(panelItem.Editable, CssClass.Editable, CssClass.ReadOnly);
panelItem.Target = dropDownList;
return new List<Control> { dropDownList, PanelValidator.Create(panelItem) };
}