Repeater ChildControls ItemTemplate ViewState Persistence

Question

Hi, I try to create a ItemTemplate for my Repeater with a tree of child controls inside an ItemTemplate. The problem is I can't find a way to persist all my controls. Each time that there is a postback, my controls are lost. I tried many things but I didn't find a way. Is anybody can help me? Here is the code that I use :

Here where I link the ItemTemplate to the repeater

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
    {
 RepeaterTemplates qt = new RepeaterTemplates(ListItemType.Item);

 repeater.ItemTemplate = qt;
 repeater.DataSource = [datasource];
 repeater.DataBind();
}
}

Here is the an example of my Itemplate.

public class RepeaterTemplates_Quizzes : ITemplate
{
   ListItemType templateType;


   public RepeaterTemplates_Quizzes(ListItemType type)
   {
      templateType = type;

   }

   public void InstantiateIn(System.Web.UI.Control container)
   {
      Literal lc = new Literal();
      switch(templateType)
      {
         case ListItemType.Header:
            //lc.Text = "<B>" + columnName + "</B>";
            //container.Controls.Add(lc);
            break;
         case ListItemType.Item:

            Panel item = new Panel();
            item.CssClass = "item";


            Panel pnlContent = new Panel();
            pnlContent.CssClass = "content";

            Panel pnl1 = new Panel();
            pnl1.CssClass = "line";

            Label lblDateCreatedtitle = new Label();
            lblDateCreatedtitle.Text = "Date Created";
            lblDateCreatedtitle.CssClass = "datecreatedtitle";
            lblDateCreatedtitle.ID = "datecreatedtitle";
            pnl1.Controls.Add(lblDateCreatedtitle);

            Label lblDateCreated = new Label();
            lblDateCreated.DataBinding += new EventHandler(this.BindDataDateCreated);
            lblDateCreated.ID = "datecreated";
            lblDateCreated.CssClass = "datecreated";
            pnl1.Controls.Add(lblDateCreated);
            pnlContent.Controls.Add(pnl1);

            item.Controls.Add(pnlContent);



            container.Controls.Add(item);

            break;
         case ListItemType.EditItem:
            //TextBox tb = new TextBox();
            //tb.Text = "";
            //container.Controls.Add(tb);
            break;
         case ListItemType.Footer:
            //lc.Text = "<I>" + columnName + "</I>";
            //container.Controls.Add(lc);
            break;
      }




   // Create a public method that will handle the
   // DataBinding event called in the InstantiateIn method.
   public void BindDataDateCreated(object sender, EventArgs e)
   {
       Label l = (Label)sender;
       RepeaterItem container = (RepeaterItem)l.NamingContainer;
       l.Text = ((DataRowView)container.DataItem)["DateCreated"].ToString();

   }
 }

Thank You