adding custom control in updatepanel dynamicly

Hey everyone

I try to make a control but I'm still expirementing and encountered a problem.
I experiment with making a custom ajax wizard so I made the base of that ajax wizard to see its result but somehow what I did is not rendering.

Problem with the code I writed is.
when I look at the html I can see the updatepanel div is there but nothing is inside. Everything I wirte in my AjaxWizardStep is not rendered in the updatepanel. How can I solve this problem becuase without updatepanel it works perfect.

The HTML I tried is here but somehow the text "This is a Test" is not rendered.

<ajax:AjaxWizard runat="server" ID="test">
            <WizardSteps>
                <ajax:AjaxWizardStep runat="server" ID="aws1">
                    This is a Test
                </ajax:AjaxWizardStep>
            </WizardSteps>
        </ajax:AjaxWizard>

namespace ajax.Web.UI.WebControls
{
    [ParseChildren(true)]
    public class AjaxWizard : Control
    {
        AjaxWizardStepCollection steps;

        [PersistenceModeAttribute(PersistenceMode.InnerProperty)]
        public virtual AjaxWizardStepCollection WizardSteps
        {
            get {
                if (steps == null)
                    steps = new AjaxWizardStepCollection();
                return steps;
            }
        }

        protected override void Render(HtmlTextWriter writer)
        {
            UpdatePanel up = new UpdatePanel();
            up.ID = this.ID;
            foreach (AjaxWizardStep step in steps)
            {
                up.ContentTemplateContainer.Controls.Add(step);
            }
            Controls.Add(up);
            up.RenderControl(writer);
            //base.Render(writer);
        }
    }

    public sealed class AjaxWizardStep : AjaxWizardStepBase
    {

    }

    public abstract class AjaxWizardStepBase : View
    {

    }

    public sealed class AjaxWizardStepCollection : IList
    {
        private ArrayList list = new ArrayList();

        internal AjaxWizardStepCollection() { }

        public IEnumerator GetEnumerator()
        {
            return list.GetEnumerator();
        }

        public object SyncRoot
        {
            get { return this; }
        }

        public bool IsSynchronized
        {
            get { return false; }
        }

        public int Count
        {
            get { return list.Count; }
        }

        public void CopyTo(AjaxWizardStepBase[] array, int index)
        {
            list.CopyTo(array, index);
        }

        void ICollection.CopyTo(Array array, int index)
        {
            list.CopyTo(array, index);
        }

        bool IList.IsFixedSize
        {
            get { return false; }
        }

        public bool IsReadOnly
        {
            get { return false; }
        }

        public AjaxWizardStepBase this[int index]
        {
            get { return (AjaxWizardStepBase)list[index]; }
        }

        object IList.this[int index]
        {
            get { return list[index]; }
            set { list[index] = value; }
        }

        public void RemoveAt(int index)
        {
            list.RemoveAt(index);
        }

        public void Remove(AjaxWizardStepBase ajaxWizardStep)
        {
            if (ajaxWizardStep == null)
                throw new ArgumentNullException("ajaxWizardStep");
            list.Remove(ajaxWizardStep);
        }

        void IList.Remove(object ob)
        {
            Remove((AjaxWizardStepBase)ob);
        }

        public void Insert(int index, AjaxWizardStepBase ajaxWizardStep)
        {
            list.Insert(index, ajaxWizardStep);
        }

        void IList.Insert(int index, object ob)
        {
            Insert(index, (AjaxWizardStepBase)ob);
        }

        public int IndexOf(AjaxWizardStepBase ajaxWizardStep)
        {
            if (ajaxWizardStep == null)
                throw new ArgumentNullException("ajaxWizardStep");
            return list.IndexOf(ajaxWizardStep);
        }

        int IList.IndexOf(object ob)
        {
            return IndexOf((AjaxWizardStepBase)ob);
        }

        public void Clear()
        {
            list.Clear();
        }

        public bool Contains(AjaxWizardStepBase ajaxWizardStep)
        {
            if (ajaxWizardStep == null)
                throw new ArgumentNullException("ajaxWizardStep");
            return list.Contains(ajaxWizardStep);
        }

        bool IList.Contains(object ob)
        {
            return Contains((AjaxWizardStepBase)ob);
        }

        public void Add(AjaxWizardStepBase ajaxWizardStep)
        {
            if (ajaxWizardStep == null)
                throw new ArgumentNullException("ajaxWizardStep");
            list.Add(ajaxWizardStep);
        }

        int IList.Add(object ob)
        {
            return list.Add((AjaxWizardStepBase)ob);
        }
    }
}

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