Hi,

Sorry for my english.

I have a custom server control that derive from Panel.

In my control I want to add an Checkbox, but after an postback it
checkbox lost the state of checked property.

My code:

   public class CheckboxPanel : System.Web.UI.WebControls.Panel,
IPostBackDataHandler
   {
       private CheckBox _chk = new CheckBox();

       protected override void CreateChildControls()
       {
           _chk = new CheckBox();
           _chk.ID = this.ClientID + "_chk";
       }

       public override void RenderBeginTag(HtmlTextWriter writer)
       {
           base.RenderBeginTag(writer);

           writer.AddStyleAttribute(HtmlTextWriterStyle.Width,
"100%");

           writer.RenderBeginTag(HtmlTextWriterTag.Table);

           writer.RenderBeginTag(HtmlTextWriterTag.Tr);

           writer.RenderBeginTag(HtmlTextWriterTag.Td);

           _chk.RenderControl(writer);

           writer.RenderEndTag();  // TD

           writer.RenderEndTag();  // TR

           writer.RenderBeginTag(HtmlTextWriterTag.Tr);

           writer.RenderBeginTag(HtmlTextWriterTag.Td);
       }

       public override void RenderEndTag(HtmlTextWriter writer)
       {
           writer.RenderEndTag();
           writer.RenderEndTag();
           writer.RenderEndTag();

           base.RenderEndTag(writer);
       }
   }