In a project with non ajax / ajax controls ( Q3 2008  version ) I want to create a master page for ajax controls.
I get the error below when I set PersistStateInCookie="true" to the  'telerik:RadPanelBar' control .If  I set PersistStateInCookie = "false"   it is working but it doesn't keep my selection.



 <telerik:RadSlidingPane ID="RadSlidingPane1" runat="server" Scrolling="None" 
      Width="180px" Style="margin: 0px; padding: 0px" BorderWidth="0px" OnClientPaneDocked="SlidePaneDocked"
          OnClientPaneUnDocked="SlidePaneUnDocked" Index="0">
                            
      <asp:ContentPlaceHolder ID="contentLeft" runat="server">
      </asp:ContentPlaceHolder>
 
      
      <asp:UpdatePanel ID="upMaster" runat="server" UpdateMode="Conditional">
           <ContentTemplate>
               <asp:UpdateProgress ID="UpdateProgress1" AssociatedUpdatePanelID="upMaster" DynamicLayout="true"
                                        runat="server">
                  <ProgressTemplate>
                         (...loading)
                  </ProgressTemplate>
               </asp:UpdateProgress>
               
                <div style="float: left">   
                    <telerik:RadPanelBar ID="leftPanels" runat="server" Height="100%" ExpandMode="SingleExpandedItem" Width="180px" 
                        PersistStateInCookie="true" />
                </div>
           </ContentTemplate>
      </asp:UpdatePanel>
 
   </telerik:RadSlidingPane>

[InvalidOperationException: Cannot convert object of type 'System.String' to type 'System.String[]']

   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer) +305914

   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToType(Object o, Type type, JavaScriptSerializer serializer) +192

   System.Web.Script.Serialization.ObjectConverter.AssignToPropertyOrField(Object propertyValue, Object o, String memberName, JavaScriptSerializer serializer) +284

   System.Web.Script.Serialization.ObjectConverter.ConvertDictionaryToObject(IDictionary`2 dictionary, Type type, JavaScriptSerializer serializer) +1349

   System.Web.Script.Serialization.ObjectConverter.ConvertObjectToType(Object o, Type type, JavaScriptSerializer serializer) +192

   System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(String input) +66

   Telerik.Web.UI.RadPanelBar.LoadState(String state) +152

   Telerik.Web.UI.RadPanelBar.LoadStateFromCookie() +257

   Telerik.Web.UI.RadPanelBar.OnPreRender(EventArgs e) +60

   System.Web.UI.Control.PreRenderRecursiveInternal() +108

   System.Web.UI.Control.PreRenderRecursiveInternal() +224

   System.Web.UI.Control.PreRenderRecursiveInternal() +224

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3394



Thank you 

Laurentiu

The markup defined for the asp.net TreeView is:-

  Please help regarding this. Just the telerik equivalent. (For ex. PopulateOnDemand, TreeNodeSelectionAction.Expand etc etc)

Thanks a lot
XORV

 protected void RadGrid_ItemDataBound(object sender, GridItemEventArgs e)
        {
            if (e.Item is GridHeaderItem)
            {
                GridHeaderItem headerItem = (GridHeaderItem)e.Item;
                HashSet<string> columnNames = (HashSet<string>)ViewState["Columns"];
                foreach (string columnName in columnNames)
                {
                    Image image = new Image();

                    image.ImageUrl = columnName + ".png";
                    headerItem[columnName].Controls.Add(image);
                }
            } 
 
        }
Could some one help me with displaying both text and image for each of the columns? Thanks very much.