RadEditor in RadGrid with AjaxManagerProxy

[Stacy]

I have an editor in the edit form of my radgrid which is ajaxified via an AjaxManager on the master page and an AjaxManagerProxy on the content page.  I am setting the content property of the editor on the ItemCreated event of the grid.  On ItemCommand of the grid I call a save method where I find the editor and get the content from the editor.  If I take the AjaxManagerProxy off the page this all works fine but with the proxy on the page the content property of the editor is always empty.  I am guessing with ajaxifying the grid the ItemCreated event is being called again overwriting the content property.  Any help anyone can provide me on how to "fix" this issue is appreciated.  I will post my aspx and .cs pages

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Projects.aspx.cs" Inherits="Projects" %>
<%@ MasterType VirtualPath="~/MasterPage.master" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <script type="text/javascript">
        function onRequestStart(sender, args) {
            if (args.get_eventTarget().indexOf("ExportToExcelButton") >= 0 ||
                    args.get_eventTarget().indexOf("ExportToWordButton") >= 0 ||
                    args.get_eventTarget().indexOf("ExportToPdfButton") >= 0 ||
                    args.get_eventTarget().indexOf("ExportToCsvButton") >= 0) {

                args.set_enableAjax(false);
            }
        }
    </script>
<telerik:RadAjaxManagerProxy ID="AjaxManagerProxyProjects" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="RadGridProjects">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadGridProjects" LoadingPanelID="RadAjaxLoadingPanel1" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManagerProxy>
<telerik:RadAjaxLoadingPanel  ID="RadAjaxLoadingPanel1" runat="server" Skin="Black" />
<telerik:RadGrid  ID="RadGridProjects" AllowSorting="True"
            AllowPaging="True" PageSize="50" runat="server" GridLines="None"
            Width="100%" ShowStatusBar="true" AllowFilteringByColumn="true"
            AutoGenerateColumns="false" AllowAutomaticInserts="false"
            AllowAutomaticDeletes="false" AllowAutomaticUpdates="false"
            GroupingSettings-CaseSensitive="false"
            ShowGroupPanel="true" Skin="Black"
            OnPreRender="RadGridProjects_PreRender"
            OnItemCreated="RadGridProjects_ItemCreated"
            OnNeedDataSource="RadGridProjects_NeedDataSource"
            OnItemCommand="RadGridProjects_ItemCommand"
            OnItemDataBound="RadGridProjects_ItemDataBound">
            <PagerStyle  Mode="NextPrevNumericAndAdvanced"></PagerStyle>
            <ExportSettings OpenInNewWindow="true" ExportOnlyData="true"
                    Pdf-AllowPrinting="true" Pdf-AllowAdd="true" Pdf-AllowCopy="true"
                    Pdf-AllowModify="true" IgnorePaging="true" FileName="Projects" Pdf-PageTitle="Projects"  >
            </ExportSettings>
            <MasterTableView Width="100%" CommandItemDisplay="Top" DataKeyNames="ProjectID"
               EditMode="EditForms" AllowMultiColumnSorting="true" TableLayout="Auto" EnableHeaderContextMenu="true">
                <CommandItemSettings
                    AddNewRecordText="Add Project"
                    ShowExportToWordButton="true"
                    ShowExportToExcelButton="true"
                    ShowExportToCsvButton="true"
                    ShowExportToPdfButton="true"
                    />
                <Columns>
                    <telerik:GridBoundColumn HeaderText="Photographer" UniqueName="Photographer"></telerik:GridBoundColumn>
                    <telerik:GridDateTimeColumn  DataField="ProjectDate" HeaderText="Date"
                                    UniqueName="ProjectDate" DataFormatString="{0:d}" PickerType="DatePicker" >
                    </telerik:GridDateTimeColumn>
                    <telerik:GridBoundColumn DataField="ProjectID" HeaderText="Project ID" UniqueName="ProjectID"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="LocationOrEventName" HeaderText="Location/Event Name" UniqueName="LocationEventName"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="Volume" HeaderText="Volume" UniqueName="Volume"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="SpecialInstructions" HeaderText="Special Instructions" UniqueName="SpecialInstructions"></telerik:GridBoundColumn>
                    <telerik:GridBoundColumn DataField="Notes" HeaderText="Notes" UniqueName="Notes"></telerik:GridBoundColumn>
                    <telerik:GridEditCommandColumn UniqueName="EditCommandColumn" ButtonType="ImageButton">
                        <ItemStyle Width="45px" HorizontalAlign="Center" />
                        <HeaderStyle Width="45px" />
                    </telerik:GridEditCommandColumn>
                    <telerik:GridButtonColumn ButtonType="ImageButton" CommandName="Delete"
                        ConfirmDialogType="RadWindow"
                        ConfirmText="Are you sure you want to delete this Project?"
                        ConfirmTitle="Product Delete" Text="Delete" UniqueName="DeleteCommandColumn">
                            <ItemStyle HorizontalAlign="Center" Width="45px" />
                            <HeaderStyle Width="45px" />
                    </telerik:GridButtonColumn>
                </Columns>
                <EditFormSettings ColumnNumber="2" EditFormType="Template" CaptionDataField="LocationOrEventName,ProjectID " CaptionFormatString="Edit {0} - {1}">
                    <FormTemplate>
                        <table width="100%">
                            <tr>
                                <td colspan="2">
                                    <asp:ValidationSummary ID="ValidationSummaryProject" runat="server" ValidationGroup="Product" CssClass="failureNotification" />
                                </td>
                            </tr>
                             <tr>
                                <td colspan="2">
                                    <asp:Label ID="LabelProjectID" runat="server" Text='ProjectID: <%#Eval ("ProjectID") %>'></asp:Label>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    <span class="requiredFldInd">*</span>Photographer:
                                </td>
                                <td>
                                    <telerik:RadComboBox ID="RadComboBoxPhotographer" runat="server"
                                        DataTextField="FullName" DataValueField="PhotographerID" Skin="Black" OnDataBound="ComboBoxPhotographer_DataBound">
                                    </telerik:RadComboBox>
                                    <asp:RequiredFieldValidator ID="RequiredFieldValidatorPhotographer" runat="server" ControlToValidate="RadComboBoxPhotographer"
                                        ErrorMessage="Photographer is required." ToolTip="Photographer is required." ValidationGroup="Project">*</asp:RequiredFieldValidator>
                                </td>
                            </tr>
                            <tr>
                                <td><span class="requiredFldInd">*</span>Location/Event Name:</td>
                                <td>
                                    <asp:TextBox ID="TextBoxLocationEventName" runat="server" Text='<%#Eval("LocationOrEventName") %>'></asp:TextBox>
                                    <asp:RequiredFieldValidator ID="RequiredFieldValidatorName" runat="server" ControlToValidate="TextBoxLocationEventName"
                                        ErrorMessage="Location/Event Name is required." ToolTip="Location/Event Name is required." ValidationGroup="Project">*</asp:RequiredFieldValidator>
                                </td>
                            </tr>
                             <tr>
                                <td><span class="requiredFldInd">*</span>Date:</td>
                                <td>
                                    <telerik:RadDatePicker ID="DatePickerProjectDate" runat="server" Skin="Black"
                                        Culture="English (United States)" ShowPopupOnFocus="true" EnableScreenBoundaryDetection="true"
                                        PopupDirection="BottomRight" ShowAnimation-Type="Fade"
                                        SelectedDate='<%#(Eval("ProjectDate") is DBNull ?DateTime.Today:Eval("ProjectDate")) %>' MinDate="1/1/1900">
                                        <Calendar>
                                            <SpecialDays>
                                                <telerik:RadCalendarDay Repeatable="Today" ItemStyle-CssClass="rcToday" />
                                            </SpecialDays>
                                        </Calendar>
                                    </telerik:RadDatePicker>
                                    <asp:RequiredFieldValidator ID="RequiredFieldProjectDate" runat="server"
                                        ControlToValidate="DatePickerProjectDate"
                                        ErrorMessage="Project Date is required"
                                        ValidationGroup="Project">*</asp:RequiredFieldValidator>
                                </td>
                            </tr>
                            <tr>
                                <td>Volume:</td>
                                <td>
                                    <asp:TextBox ID="TextBoxVolume" runat="server" Text='<%#Eval("Volume") %>'></asp:TextBox>
                                </td>
                            </tr>
                             <tr>
                                <td valign="top">Special Instructions:</td>
                                <td>
                                    <telerik:RadEditor ID="RadEditorInstructions" runat="server" ToolsWidth="450px" Height="250px" Width="495px"
                                    EditModes="Design"
                                    ToolsFile="~/App_Data/Tools.xml"
                                    ContentFilters="FixUlBoldItalic, MozEmStrong, ConvertFontToSpan, ConvertToXhtml, FixEnclosingP"
                                    Skin="Black">
                                        <CssFiles>
                                            <telerik:EditorCssFile Value="~/App_Themes/EditorContentAreaStyles.css" />
                                        </CssFiles>
                                    </telerik:RadEditor>
                                </td>
                            </tr>
                            <tr>
                                <td valign="top">Notes:</td>
                                <td>
                                    <telerik:RadEditor ID="RadEditorNotes" runat="server" ToolsWidth="450px" Height="250px" Width="495px"
                                    EditModes="Design" ToolbarMode="ShowOnFocus"
                                    ToolsFile="~/App_Data/Tools.xml"
                                    ContentFilters="FixUlBoldItalic, MozEmStrong, ConvertFontToSpan, ConvertToXhtml, FixEnclosingP"
                                    Skin="Black">
                                        <CssFiles>
                                            <telerik:EditorCssFile Value="~/App_Themes/EditorContentAreaStyles.css" />
                                        </CssFiles>
                                    </telerik:RadEditor>
                                </td>
                            </tr>
                            <tr>
                            <td align="right" colspan="2">
                                <asp:Button ID="ButtonProjectSave" runat="server" UseSubmitBehavior="false"
                                        Text='<%# (Container is GridEditFormInsertItem) ? "Insert" : "Update" %>'
                                        CommandName='<%# (Container is GridEditFormInsertItem) ? "PerformInsert" : "Update" %>' ValidationGroup="Project">
                                </asp:Button>
                                    &nbsp;
                                <asp:Button ID="ButtonProjectCancel" Text="Cancel" runat="server" CausesValidation="False" CommandName="Cancel">
                                </asp:Button>
                            </td>
                        </tr>
                        </table>
                    </FormTemplate>
                </EditFormSettings>
            </MasterTableView>
            <ClientSettings AllowDragToGroup="true" AllowAutoScrollOnDragDrop="true"
                AllowColumnHide="true" AllowColumnsReorder="true" AllowExpandCollapse="true"
                AllowGroupExpandCollapse="true" Resizing-AllowColumnResize="true">
            </ClientSettings>
        </telerik:RadGrid>
</asp:Content>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;

using AgriGraphicsLibrary.Business;
using AgriGraphicsLibrary.Entity;

using Sundial.Core.BusinessDataEntities;

using Telerik.Web.UI;

public partial class Projects : SundialBasePage
{
    bool isPDFExport = false;
    private class PageSessionVariables
    {
        public const string ProjectList = "ITSProjects.ProjectList";
        public const string CurrentProject = "ITSProjects.CurrentProject";
        public const string UserPhotographer = "ITSProjects.UserPhotographer";
    }


    #region Attributes

    #endregion

    #region Properties

    private List<ProjectEntity> ProjectList
    {
        get
        {
            List<ProjectEntity> projects = new List<ProjectEntity>();

            if (Session[PageSessionVariables.ProjectList] != null)
            {
                projects = (List<ProjectEntity>)Session[PageSessionVariables.ProjectList];
            }
            else
            {
                if (AGContext.IsUserPhotographer)
                {
                    projects = ProjectBL.GetByPhotographerID(this.UserPhotographer.PhotographerID);
                }
                else
                {
                    projects = ProjectBL.GetAll(ActiveFlagEnum.Active);
                }
                Session[PageSessionVariables.ProjectList] = projects;
            }
            return projects;
        }
        set
        {
            Session[PageSessionVariables.ProjectList] = value;
        }
    }

    private PhotographerEntity UserPhotographer
    {
        get
        {
            PhotographerEntity photographer = new PhotographerEntity();
            if (Session[PageSessionVariables.UserPhotographer] != null)
            {
                photographer = (PhotographerEntity)Session[PageSessionVariables.UserPhotographer];
            }
            return photographer;
        }
        set
        {
            Session[PageSessionVariables.UserPhotographer] = value;
        }
    }

    private ProjectEntity CurrentProject
    {
        get
        {
            ProjectEntity project = new ProjectEntity();

            if (Session[PageSessionVariables.CurrentProject] != null)
            {
                project = (ProjectEntity)Session[PageSessionVariables.CurrentProject];
            }

            return project;
        }
        set
        {
            Session[PageSessionVariables.CurrentProject] = value;
        }
    }

    #endregion

    #region Page Events

    protected void Page_Load(object sender, EventArgs e)
    {
        RadAjaxManager manager = RadAjaxManager.GetCurrent(Page);
        manager.ClientEvents.OnRequestStart = "onRequestStart";
        SetPagePermissions();

        if (!IsPostBack)
        {
            ClearSessions();
        }
    }

    protected void RadGridProjects_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
    {
        if (!e.IsFromDetailTable)
        {
            RadGridProjects.DataSource = this.ProjectList;
        }
    }

    protected void RadGridProjects_ItemCommand(object source, GridCommandEventArgs e)
    {
        GridEditableItem editedItem = e.Item as GridEditableItem;

        switch (e.CommandName)
        {
            case RadGrid.EditCommandName:
                {
                    //get the id from the record we are editing
                    //read the entity
                    this.CurrentProject = ProjectBL.Read((Int64)editedItem.GetDataKeyValue("ProjectID"));
                    break;
                }
            case RadGrid.InitInsertCommandName:
                {
                    //set to a new entity
                    this.CurrentProject = new ProjectEntity();
                    break;
                }
            case RadGrid.UpdateCommandName:
                {
                    if (IsValid)
                    {
                        try
                        {
                            SaveProject(editedItem);
                            //clear the session variable so it gets the new information
                            Session[PageSessionVariables.ProjectList] = null;
                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                    }
                    break;
                }
            case RadGrid.PerformInsertCommandName:
                {
                    if (IsValid)
                    {
                        try
                        {
                            SaveProject(editedItem);
                            //clear the session variable so it gets the new information
                            Session[PageSessionVariables.ProjectList] = null;
                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                    }
                    break;
                }
            case RadGrid.RebindGridCommandName:
                {
                    //clear the session variable so it gets the new information
                    Session[PageSessionVariables.ProjectList] = null;
                    break;
                }
            case RadGrid.DeleteCommandName:
                {
                    //delete the project
                    ProductBL.Delete((Int64)editedItem.GetDataKeyValue("ProductID"), AGContext.UserInfo.UserID.ToString());
                    //clear the session variable so it gets the new information
                    Session[PageSessionVariables.ProjectList] = null;
                    break;
                }
            case RadGrid.ExportToPdfCommandName:
                {

                    isPDFExport = true;
                    //RadGridProducts.ExportSettings.Pdf.PageHeight = Unit.Parse("210mm");
                    //RadGridProducts.ExportSettings.Pdf.PageWidth = Unit.Parse("297mm");
                    RadGridProjects.ExportSettings.Pdf.PageLeftMargin = Unit.Parse("1mm");
                    RadGridProjects.ExportSettings.Pdf.PageRightMargin = Unit.Parse("1mm");
                    RadGridProjects.ExportSettings.Pdf.PageHeaderMargin = Unit.Parse("10mm");
                    RadGridProjects.ExportSettings.Pdf.PageFooterMargin = Unit.Parse("10mm");
                    //RadGridProducts.MasterTableView.GetColumn("Email").HeaderStyle.Width = Unit.Pixel(200);
                    break;
                }
        }
    }

    protected void RadGridProjects_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item.ItemType == GridItemType.Item || e.Item.ItemType == GridItemType.AlternatingItem)
        {
            GridDataItem item = e.Item as GridDataItem;

            ProjectEntity entity = (ProjectEntity)e.Item.DataItem;

            List<ImageEntity> images = ImageBL.GetByProjectID(entity.ProjectID);

            PhotographerDisplayEntity pde = PhotographerDisplayBL.GetByPhotographerID(entity.PhotographerID);
            item["Photographer"].Text = pde.FullName;

            //if there are images associated with this project you can't delete it
            if (images.Count > 0)
            {
                item["DeleteCommandColumn"].Controls[0].Visible = false;
            }
        }

    }

    protected void RadGridProjects_PreRender(object sender, EventArgs e)
    {
        foreach (GridColumn col in RadGridProjects.MasterTableView.Columns)
        {
            if (col.UniqueName == "EditCommandColumn")
            {
                col.Visible = ApplicationFeature.GetPermission(AGContext.UserInfo.PersonID, ApplicationFeature.Projects).CanUpdate;
            }
            if (col.UniqueName == "DeleteCommandColumn")
            {
                col.Visible = ApplicationFeature.GetPermission(AGContext.UserInfo.PersonID, ApplicationFeature.Projects).CanDelete;
            }
        }
    }

    protected void RadGridProjects_ItemCreated(object sender, Telerik.Web.UI.GridItemEventArgs e)
    {
        if (isPDFExport)
            FormatItem(e.Item);
        if (e.Item is GridCommandItem)
        {
            //get the add button/image
            LinkButton addButton = (LinkButton)e.Item.FindControl("InitInsertButton");
            Button addImage = (Button)e.Item.FindControl("AddNewRecordButton");
            //hide the button/image if they don't have the feature
            addButton.Visible = ApplicationFeature.GetPermission(AGContext.UserInfo.PersonID, ApplicationFeature.Projects).CanCreate;
            addImage.Visible = ApplicationFeature.GetPermission(AGContext.UserInfo.PersonID, ApplicationFeature.Projects).CanCreate;
        }
        if ((e.Item is GridEditFormItem) && e.Item.IsInEditMode)
        {
            GridEditFormItem editItem = (GridEditFormItem)e.Item;
            ProjectEntity pe = this.CurrentProject;
            RadComboBox cb = (RadComboBox)editItem.FindControl("RadComboBoxPhotographer");
            RadEditor resi = (RadEditor)editItem.FindControl("RadEditorInstructions");
            RadEditor ren = (RadEditor)editItem.FindControl("RadEditorNotes");
            Label lb = (Label)editItem.FindControl("LabelProjectID");
            cb.DataSource = PhotographerDisplayBL.GetAll(ActiveFlagEnum.Active);
            cb.DataBind();

                resi.Content = pe.SpecialInstructions;
                ren.Content = pe.Notes;
            if (AGContext.IsUserPhotographer)
            {
                cb.SelectedValue = this.UserPhotographer.PhotographerID.ToString();
                cb.Enabled = false;
                if (editItem.OwnerTableView.IsItemInserted)
                {
                    lb.Visible = false;
                }
            }
            else
            {
                if (!editItem.OwnerTableView.IsItemInserted)
                {

                    if (pe.ProjectID != ProjectEntity.ProjectIDDefault)
                    {
                        cb.SelectedValue = pe.PhotographerID.ToString();
                    }
                    else
                    {
                        cb.SelectedValue = "-1";
                    }
                }
                else
                {
                    lb.Visible = false;
                }
            }
        }
    }

    protected void ComboBoxPhotographer_DataBound(object sender, EventArgs e)
    {
        RadComboBox cb = (RadComboBox)sender;

        cb.Items.Insert(0, new RadComboBoxItem("Select One....", "-1"));
    }

    #endregion


    #region Load Data

    #endregion

    #region Save Data

    private void SaveProject(GridEditableItem editItem)
    {
        ProjectEntity entity = this.CurrentProject;
        entity.LocationOrEventName = ((editItem.FindControl("TextBoxLocationEventName") as TextBox).Text);
        RadEditor ren = editItem.FindControl("RadEditorNotes") as RadEditor;
        entity.Notes = ren.Content;
        entity.PhotographerID = Convert.ToInt64((editItem.FindControl("RadComboBoxPhotographer") as RadComboBox).SelectedValue);
        entity.ProjectDate = (DateTime)(editItem.FindControl("DatePickerProjectDate") as RadDatePicker).SelectedDate;
        entity.SpecialInstructions = (editItem.FindControl("RadEditorInstructions") as RadEditor).Content;
        entity.Volume = ((editItem.FindControl("TextBoxVolume") as TextBox).Text);
        entity.ModifiedBy = AGContext.UserInfo.UserID.ToString();
        ProjectBL.Update(entity);
    }

    #endregion

    #region Custom Code

    private void SetPagePermissions()
    {
        VerifyPageAccess(AGContext.UserInfo.PersonID, ApplicationFeature.Projects);
    }

    private void SetControlPermissions()
    {

    }

    private void ClearSessions()
    {
        Session[PageSessionVariables.ProjectList] = null;
        Session[PageSessionVariables.CurrentProject] = null;
        Session[PageSessionVariables.UserPhotographer] = null;
    }

    private void RebindGrids()
    {

    }

    private void FormatItem(GridItem gridItem)
    {
        foreach (TableCell cell in gridItem.Cells)
        {
            cell.Style["font-family"] = "Arial Narrow";
            cell.Style["font-size"] = "12pt";
            //cell.Width = Unit.Parse("300px");
        }
        switch (gridItem.ItemType)
        {
            //case GridItemType.Item: gridItem.Style["background-color"] = "#9999ff"; break;
            //case GridItemType.AlternatingItem: gridItem.Style["background-color"] = "#ccccff"; break;
            //case GridItemType.Header: gridItem.Style["background-color"] = "#aaa"; break;
        }
    }

    #endregion
}

[Daniel]

Hello Stacy,

We tried to reproduce the problem but unfortunately to no avail. Please download the attached demo project and let me know if I'm missing something.

Best regards,
Daniel
the Telerik team

[Stacy]

Daniel,
The first thing I noticed is that I am using framework 4.0 with vs2010 and the 2010.1.519 version of Telerik.Web.UI.  I am currently working on putting a running version of my project to submit through a support ticket.

Stacy

[Sebastian]

Hello Stacy,

We will test the sample project after you submit it via a support ticket and will get back to you with our findings.
 
Best regards,
Sebastian
the Telerik team

[Tony Monaco]

Hi,

I just ran into this same problem with the 2001.1.413.40 version of the controls.  The wierd thing was that I had a second grid with a RadEditor on the same page that was working just fine!  The non working grid was using a GridHTMLEditorColumn  with the grid edit mode as "InPlace".  The working grid was using "EditForms" with an edit form type as "Template".

In the non-working grid, I tried changing the column type to GridTemplateColumn, and using a normal RadEditor in the edit item template.  The problem still persisted.  It wasn't until I re-coded the grid as an "EditForms" that the problem disappeared.

Hope this info helps someone...

Cheers

Tony

[Daniel]

Hello Tony,

Could you please try to isolate the problem in a runnable demo? I will debug it locally and will do my best to find out the root cause.
Isolating a problem in a sample project

Regards,
Daniel
the Telerik team

[Rumen]

Hello Tony,

I just answered your support ticket. To share the solution with the community I am pasting my answer below:

The reported problem is discussed in the following KB article: RadEditor Content Not Saved After Ajax Update in Firefox, Google Chrome and Safari. To fix it attach the following function to the OnItemCreated server event of RadGrid:

protected void UserGrid_ItemCreated(object sender, GridItemEventArgs e)
{
    if (e.Item is GridEditableItem && e.Item.IsInEditMode)
    {
        string buttonId = "PerformInsertButton";

        ImageButton but = e.Item.FindControl(buttonId) as ImageButton;
        if(but != null) but.Attributes.Add("onclick", @"javascript:__doPostBack('" + but.UniqueID + "',''); return false;");
    }
}

Greetings,
Rumen
the Telerik team