Setting dataindex on usercontrol is not correctly showing the data in the combobox contained in the usercontrol

[eqttester]

I have the following code.

        <ext:FormPanel ID=testContainer runat="server"> 
             <Content><mgr:list DataIndex = "sampleCode" runat="server" width=70px />
                        <ext:ComboBox ID="test" runat="server"  DataIndex = "sampleCode"/>
             </Content>            
         </ext:FormPanel>

The mgr:list control shows nothing but the test combo box shows the data correctly.

The code inside my mbr:list control looks like this

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>      
    <ext:ComboBox ID="cboTest" runat="server" >
    </ext:ComboBox>

In the code behind I am setting the following info.

[DefaultValue( "" )]
        [Bindable( true )]
        public string FieldLabel {
            get {
                return cboList.FieldLabel;
            }
            set {
                cboList.FieldLabel = value;
            }
        }
        [DefaultValue( "" )]
        [Bindable( true )]
        public string Text {
            get {
                return cboList.Text;
            }
            set {
                cboList.Text = value;
            }
        }
        [DefaultValue( null )]
        [Bindable( true )]
        public Object Value {
            get {
                return cboList.Value;
            }
            set {
                cboList.Value = value;
            }
        }      
        [DefaultValue( "" )]
        [Bindable( true )]
        public string DataIndex {
            get {
                return cboList.DataIndex;
                
            }
            set {
                cboList.DataIndex = value;
                
            }
        }