[ParseChildren(true,"BarItems"),
 PersistChildren(false)
 ]
 public class ToolsBar : System.Web.UI.Control
 {
  
  private BarItemsCollection _toolsBarItems;

  public ToolsBar()
  {
   _toolsBarItems=new BarItemsCollection();

  }

  [
  Category("Behavior"),
  Description("BarItems"),
  DesignerSerializationVisibility(DesignerSerializationVisibility.Content),      
  NotifyParentProperty(true),
  PersistenceMode(PersistenceMode.InnerProperty)
  ]
  public BarItemsCollection BarItems
  {
   get
   {
    if (_toolsBarItems == null)
    {
     _toolsBarItems = new BarItemsCollection();
    }
    return _toolsBarItems;
   }
  }

  protected override void Render(HtmlTextWriter writer)
  {
   writer.RenderBeginTag(HtmlTextWriterTag.Div);
   writer.RenderBeginTag(HtmlTextWriterTag.Table);
   writer.RenderBeginTag(HtmlTextWriterTag.Tr);

   foreach (BarItem item in BarItems)
   {
    writer.RenderBeginTag(HtmlTextWriterTag.Td);
    writer.AddAttribute(HtmlTextWriterAttribute.Class,"ToolsBar_ButtonNormal");
    writer.AddAttribute(HtmlTextWriterAttribute.Onclick,"heditor.Preview();");
    writer.AddAttribute("noWrap","false");
    writer.AddAttribute("onMouseDown","ButtonDown(this,0,0)");
    writer.AddAttribute("onMouseUp","ButtonUp(this,0,0)");

    writer.RenderBeginTag("img");
    writer.AddAttribute("src", item.ImageUrl);
    writer.RenderEndTag();

    writer.RenderEndTag();
   }
   writer.RenderEndTag();
   writer.RenderEndTag();
   writer.RenderEndTag();
  }

}


以 上代码，在呈现时HTML代码中老是这样：
 <cc1:toolsbar id="ToolsBar1" runat="server">
    <BarItems>
     <cc1:BarItem></cc1:BarItem>
     <cc1:BarItem></cc1:BarItem>
     <cc1:BarItem></cc1:BarItem>
    </BarItems>
</cc1:toolsbar>  
多出<BARITEMS></BARITEMS>标签，这不是我想要的，而且运行时也会出错！请高手指点......