Radgrid sorting not working when dynamically loading it inside a usercontrol.

[Ravi]

I have a grid named gvTabList which in inside the usercontrol . I load this usercontrol at runtime from Default.aspx when an image button is clicked.

<telerik:RadAjaxManager ID="radAjaxManagerTab" runat="server">
                               <AjaxSettings>
                                   <telerik:AjaxSetting AjaxControlID="gvTabList">
                                       <UpdatedControls>
                                           <telerik:AjaxUpdatedControl ControlID="gvTabList" LoadingPanelID="ajaxLoadingPanel"  />

                                       </UpdatedControls>
                                   </telerik:AjaxSetting>
                               </AjaxSettings>
                           </telerik:RadAjaxManager>
                            <telerik:RadAjaxLoadingPanel ID="ajaxLoadingPanel" runat="server" IsSticky="true"
                       Skin="Default" Style="position: absolute; z-index: 101; top: 0; left: 0;">
                       <img alt="Loading" src="../Images/Loading.gif" />
                   </telerik:RadAjaxLoadingPanel>
                           <telerik:RadGrid ID="gvTabList" runat="server" Skin="WebBlue" AllowFilteringByColumn="True"
                               AllowPaging="True" PageSize="5" AllowSorting="True"
                                OnNeedDataSource="gvTabList_NeedDataSource"
                                OnInit="gvTabList_Init"
                                AutoGenerateColumns="False" GridLines="None" OnSortCommand="gvTabList_SortCommand" EnableAJAX="True" >
                               <GroupingSettings CaseSensitive="false" />
                               <MasterTableView AllowFilteringByColumn="true" AllowMultiColumnSorting="false" AllowCustomSorting="true">
                                   <RowIndicatorColumn Visible="False">
                                       <HeaderStyle Width="20px"></HeaderStyle>
                                   </RowIndicatorColumn>
                                   <ExpandCollapseColumn Visible="False">
                                       <HeaderStyle Width="19px"></HeaderStyle>
                                   </ExpandCollapseColumn>
                                   <CommandItemSettings ExportToPdfText="Export to Pdf" />
                                   <Columns>
                                       <telerik:GridBoundColumn AllowFiltering="False" DataField="ID" HeaderText="HEDIS #"
                                           UniqueName="HedisID">
                                           <HeaderStyle HorizontalAlign="Center" Width="140" />
                                           <ItemStyle HorizontalAlign="Center" />
                                       </telerik:GridBoundColumn>
                                       <telerik:GridBoundColumn AllowFiltering="False" DataField="HedisSubMeasure" HeaderText="HEDIS Domain"
                                           UniqueName="HedisDomain">
                                           <HeaderStyle HorizontalAlign="Center" Width="150" />
                                           <ItemStyle HorizontalAlign="Center" />
                                       </telerik:GridBoundColumn>

                                   </Columns>
                               </MasterTableView>
                                <PagerStyle Mode="NumericPages" />
                           </telerik:RadGrid>

I need to display this control when the user clicks the image button that is why I have kept it inside btnLoadControl_Click event. But there are so many forums saying controls have to be loaded either during Page_Load or Init method. I am not sure how to do that.

protected void btnLoadControl_Click(object sender, ImageClickEventArgs e)
       {
             UserControl control = (UserControl)LoadControl("~/Controls/" + Usercontrolname + ".ascx");

       }

There is no problem loading the usercontrol when the condition is met. But the problem is when I click the heading of any column, the sortorder does not change. I have my funtion to handle the CustomSorting which is given below.

protected void gvTabList_SortCommand(object source, GridSortCommandEventArgs e)
       {
            GridSortExpression sortExpr = new GridSortExpression();
           switch (e.OldSortOrder)
           {
               case GridSortOrder.None:
                   sortExpr.FieldName = e.SortExpression;
                   sortExpr.SortOrder = GridSortOrder.Descending;
                   e.Item.OwnerTableView.SortExpressions.AddSortExpression(sortExpr);
                   break;
               case GridSortOrder.Ascending:
                   sortExpr.FieldName = "ID";
                   sortExpr.SortOrder = GridSortOrder.Ascending;
                   e.Item.OwnerTableView.SortExpressions.AddSortExpression(sortExpr);

                   break;
               case GridSortOrder.Descending:
                   sortExpr.FieldName = e.SortExpression;
                   sortExpr.SortOrder = GridSortOrder.Ascending;
                   e.Item.OwnerTableView.SortExpressions.AddSortExpression(sortExpr);

                   break;
           }
           e.Canceled = true;
           gvTabList.Rebind();

       }

I checked by debugging, but " e.OldSortOrder" always gives "None" type.
Is this problem related with dynamically loading the usercontrol . As you can see I need this usercontrol only when the Image button is clicked. so I am not loading it in Init method.
If any one has faced this problem, please send me the solution. It will be a great help.

[Cabot]

I am also having this problem with the latest release of the RadGrid control

[Marin]

Hi,

 If you dynamically load a user control make sure that this is done in the Init or Load event of the page. This way the viewstate of the grid will managed properly and all the features should work as expected. Additionally about ajaxifying dynamically loaded user controls you can have a look at this help topic.

Kind regards,
Marin
the Telerik team

[RB]

Were you able to resolve this? I have the same problem!