ajaxToolKit: ReorderList dynamique

Bonjour a tous!
J'essaie d'implementer une ajaxToolkit:ReorderList dynamiquement. Pour la construire tout va bien. Le probleme arrive quand j'essaie de reordonner la liste, j'obtiens toujours ce message d'erreur :
1) popup : "error"
2)popup: "Reorder failed, see details below.\r\n\r\nThe target 'AAAAA' for the callback could not be found or did not implement ICallbackEventHandler."
Si j'utilise une ajaxToolkit:ReorderList dans le .aspx avec la meme sqldatasource, cette erreur n'apparait pas.
J'ai donc du oublier un evenement ou quelque chose d'autre mais j'ai un peu de mal a trouver.

Voici le code :

Code:

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private void LoadChildColumns(String panelID)
    {
        TableRow tr = new TableRow();
        TableCell td = new TableCell();
 
        ReorderList roList = new ReorderList();
 
        roList.PostBackOnReorder = false;
        roList.CallbackCssStyle = "callbackStyle";
        roList.AllowReorder = true;
        roList.DragHandleAlignment = ReorderHandleAlignment.Left;
        roList.DataKeyField = "SLPropertyColumnID";
        roList.SortOrderField = "DataIndex";
        roList.DataSource = GetDataSourceForROList(panelID);
        roList.ItemInsertLocation = ReorderListInsertLocation.Beginning;
        roList.ItemTemplate = new CustomItemTemplate(roList);
        roList.DragHandleTemplate = new CustomDragHandleTemplate(roList);
        roList.ReorderTemplate = new CustomReorderTemplate(roList);
 
        td.Controls.Add(roList);
 
 
 
        GridView gv = new GridView();
        gv.GridLines = GridLines.None;
        gv.Enabled = true;
        gv.AutoGenerateColumns = false;
        gv.DataSource = GetDataSourceForROList(panelID);
 
        TemplateField tField = new TemplateField();
        tField.ItemTemplate = new CustomGridItemTemplate(gv);
        DataControlField tCol = tField;
        gv.Columns.Add(tCol);
 
        BoundField field = new BoundField();
        field.DataField = "TextLabel";
        field.HeaderText = "Prompt";
        DataControlField Col = field;
        gv.Columns.Add(Col);
 
        CheckBoxField cfield = new CheckBoxField();
        cfield.DataField = "Visibility";
        cfield.HeaderText = "Should Appear";
        DataControlField Col1 = cfield;
        gv.Columns.Add(Col1);
 
        td.Controls.Add(gv);
        gv.DataBind();
 
 
        tr.Cells.Add(td);
        dtProperty.Rows.Add(tr);
        roList.DataBind();
 
 
 
    }
 
 
    private SqlDataSource GetDataSourceForROList(String PanelID)
    {
        SqlDataSource sdc = new SqlDataSource();
        sdc.ConnectionString = ConString;
        sdc.SelectCommand = " Select p.SLPropertyColumnID, p.TextLabel, c.Visibility, c.DataIndex" +
                            " FROM SLPropertyClientConfiguration c" +
                            " LEFT OUTER JOIN SLPropertyColumnConfiguration p ON c.SLPropertyColumnID = p.SLPropertyColumnID" +
                            " WHERE c.ClientID = " + ClientID.ToString() + " AND p.SLPanelID = " + PanelID +
                            " ORDER BY c.DataIndex, p.TextLabel";
 
        //The SELECT and UPDATE methods should have the same number of fields !!!!!!!
 
        sdc.UpdateCommand = " UPDATE SLPropertyColumnConfiguration" +
                            " SET DataIndex = @DataIndex" +
                            " WHERE SLPropertyColumnID = @original_SLPropertyColumnID";
 
 
 
        sdc.OldValuesParameterFormatString = "original_{0}";
        sdc.ProviderName = "System.Data.SqlClient";
        sdc.UpdateParameters.Add(new Parameter("@DataIndex", DbType.Int32));
        sdc.UpdateParameters.Add(new Parameter("@original_SLPropertyColumnID", DbType.Int32));
        return sdc;
    }

Merci a tous pour votre aide!