Last Updated: 02 Jul 2020 12:42 by ADMIN
Release R3 2020

Editor is not maintaining the Format of text, specifically the bullet numbers, when copied from MS word. 

You can use the attached content to reproduce the problem in the Overview demo of the control.

Last Updated: 12 Jun 2020 11:11 by ADMIN
Release 2020 R2 SP1

Hello All,

I'm using a couple of Radbuttons to enable users to download some forms (in Word). This has stopped working in Chromium based browsers for some reason (new Edge, Chrome). It still works in Internet Explorer. No errors in the browser DevTools and no error on the server either.
It also does not work in Cassini (VS2017).

Not sure where to go from here - can anyone confirm/deny?

TIA - Marcus.

code stub:

<telerik:RadButton ButtonType="LinkButton" RenderMode="Lightweight" ID="btnName" runat="server" Text="Button Text" CssClass="TemplBtn" NavigateUrl="~/assets/someform.docx">
         <Icon PrimaryIconCssClass="rbDownload" />


Last Updated: 15 Jun 2020 13:38 by ADMIN
Created by: Arjan
Comments: 1
Category: ComboBox
Type: Bug Report
I believe there's a bug in the RadComboBox WebServiceSettings tag. I use a webservice to populate the items for this RadComboBox

When I put in a fully qualified domain name in the property 'Path' and the hostname contains uppercase characters, I receive a 500 error. If the hostname is in lowercase, the items are populated correctly. The error is: Uncaught TypeError: Cannot read property 'webServiceFailedNoMsg' of undefined.

I've enclosed the Webservice1.asmx, the Default.aspx and their code behind files which can illustrate the problem very easily. There's also a log file with the details of the error.
Last Updated: 03 Jun 2020 16:50 by ADMIN
Release R2 2020 SP1
Created by: Fernando
Comments: 1
Category: PivotGrid
Type: Bug Report

The appearance problem can be seen on

Click on the filter icon for Product name, you will find that the save and cancel buttons are off-screen. And if you hover over Label Filters or Value Filters the window is not wide enough to fit the popout menus that show:

Last Updated: 11 Jun 2020 15:35 by ADMIN
Release R2 2020 SP1


Placing the script below under the ScriptManager of the page:

kendo.ui.Chat.fn._resetToolbarButtons = function (j) {
    var k = this.wrapper.find(".k-toolbar-box");
    if (!":visible")) {;
    if (j.toolbar != false && "buttons" in j.toolbar) {
        this.options.toolbar.buttons = j.toolbar.buttons;


<telerik:RadChat runat="server" ID="RadChat1" Height="400px">
    <ClientEvents OnLoad="OnLoad"  />
    function OnLoad(sender, args) {    

Last Updated: 11 Jun 2020 14:27 by ADMIN
Release R2 2020 SP1

Reproduction code:

protected void Page_Load(object sender, EventArgs e)
    RadToolBarDropDown dropDown = new RadToolBarDropDown("PageSize");
    dropDown.CssClass = "perPageDropDown";
    dropDown.EnableImageSprite = false;
    // dropDown.Text = GetGlobalResourceObject("Insight", "Per pagina")
    // dropDown.ToolTip = GetGlobalResourceObject("Insight", "Per pagina")

<telerik:RadFileExplorer RenderMode="Lightweight" runat="server" ID="FileExplorer1" Width="595px" Height="350px"
    AllowPaging="true" PageSize="10">
    <Configuration EnableAsyncUpload="true" ViewPaths="~/"
        UploadPaths="~/" DeletePaths="~/"></Configuration>

Last Updated: 21 May 2020 09:41 by ADMIN
Release R2 2020 SP1

When the RenderMode property is set to Lightweight, File manager dialogs still load with Classic render mode, even when the <add key="Telerik.Web.UI.RenderMode" value="Lightweight" /> is set globally in the web.config:


<telerik:radeditor RenderMode="Lightweight" runat="server" id="mainRadEditor" EditModes="Design" >
            <telerik:EditorTool Name="ImageManager"/>
            <telerik:EditorTool Name="DocumentManager"/>


This is causing rendering problems and some of the icons do not load.

Last Updated: 11 Jun 2020 16:18 by ADMIN
Last Updated: 06 May 2020 15:13 by ADMIN
Release R2 2020

Workaround: Placing the following script under the ScriptManager

        kendo.spreadsheet.registerEditor('_validation_list', function () {
            var context, list;
            function create() {
                var $list = $("[id$='SpreadsheetListBoxDropDown']").first();
                var element = $list.closest(".rssPopup");

                list = $find($list.attr("id"));
                if (!this._listdropdown) {
                    var dropdown = new kendo.spreadsheet.DropDown(element);
                    this._listdropdown = dropdown;

                    list.add_selectedIndexChanged(function (sender, args) {
                        var item = list.get_selectedItem();
                        if (item) {

            function open() {
                var matrix = context.validation.from.value;
                if (matrix) {

                    var items = list.get_items();
                    matrix.each(function (el) {
                        var item = new Telerik.Web.UI.RadListBoxItem();
            return {
                edit: function (options) {
                    context = options;
                icon: 'p-icon p-i-arrow-60-down'


Last Updated: 05 May 2020 18:24 by ADMIN
Release R2 2020

An error will occur when the Index equals the number of items in the collection

private static ClientOperation<T> Remove(ControlItemCollection items, int index)
	if (index < 0 || index > items.Count) // should be >= instead
		return null;
	var item = items[index];

	var operation = new ClientOperation<T> {Item = (T) item, Type = ClientOperationType.Remove};

	return operation;

Last Updated: 21 May 2020 13:19 by ADMIN
Release R2 2020
Last Updated: 06 May 2020 15:33 by ADMIN
Release R2 2020
Created by: Dan
Comments: 0
Category: Editor
Type: Bug Report

When opening in MS Edge the Table Wizard, the items in Table Layouts tab, Select Table Style dropdown are not populated



As a temporary workaround, you can use the attached script and loaded to the DialogsScriptFile property of the Editor:

<telerik:RadEditor runat="server" DialogsScriptFile="~/dialogscript.js"></telerik:RadEditor>


Last Updated: 08 May 2020 15:53 by ADMIN
Release R2 2020

Replicated when the ClickToOpen is enabled: 

protected void Page_Load(object sender, EventArgs e) { RadGrid1.HeaderContextMenu.ClickToOpen = true; }

WORKAROUND: Loading the following script under the script manager

    var original = Telerik.Web.UI.GridColumn.prototype._onContextMenuItemClicking;
    Telerik.Web.UI.GridColumn.prototype._onContextMenuItemClicking = function (sender, args) {, sender, args);
        var item = args.get_item();
        var itemValue = item.get_value();
        if (itemValue == "FilterList" || itemValue == "FilterMenuContainer" ||
            itemValue == "AggregatesContainer" || itemValue == "FilterMenuParent" || itemValue == "ColumnsContainer" ||
            (Telerik.Web.UI.RadMenuItem.isInstanceOfType(item.get_parent()) && item.get_parent().get_value() == "ColumnsContainer")) {
            if (sender.get_clickToOpen()) {





Last Updated: 19 Jun 2020 13:53 by ADMIN
Release R2 2020

ConvertWordLists errors out when pasting bullets in a nested table inside another table from Word. 

Test with the attached word doc in the demo and you'll get the following error:

RadEditor.js:17416 Uncaught TypeError: Cannot read property 'appendChild' of null
    at b.WordListConverter.insertList (RadEditor.js:17416)
    at b.WordListConverter.convert (RadEditor.js:17570)
    at Object.convertWordLists (RadEditor.js:257)
    at Object.cleanPastedContent (RadEditor.js:146)
    at c.RadEditor._onAfterPaste (RadEditor.js:10229)
    at c.RadEditor.afterPasteDelegate (Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_QsfScriptManager_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d4.0.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3ad28568d3-e53e-4706-928f-3765912b66ca%3aea597d4b%3ab25378d2:6)


Last Updated: 12 Feb 2020 11:21 by ADMIN
Release R1 2020 SP1
Created by: david
Comments: 1
Category: MediaPlayer
Type: Bug Report
WAVE accessibility evaluation tool reports numerous errors with player button. How can we configure to avoid? Please attached image. 

 <telerik:RadMediaPlayer RenderMode="Lightweight" ID="RadMediaPlayer1" Skin="Bootstrap" runat="server" Width="340" BackColor="Black" AutoPlay="true" MimeType="video/mp4" EnableAriaSupport="true"
                        StartVolume="80" Height="200px">
Last Updated: 19 Feb 2020 12:57 by ADMIN
Release R1 2020 SP1

I issue is replicated consistently with the following simple setup, when the page is scrolled so the grid is on the top and right-clicking the column, to open the menu 

<div style="height: 200px"></div>
<telerik:RadGrid ID="RadGrid2" runat="server" AllowFilteringByColumn="true" EnableHeaderContextMenu="true">

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
        RadGrid2.DataSource = Enumerable.Range(1, 3).Select(x => new { ID = 1, Desc = "Some text" });
<div style="height: 4000px"></div>

Last Updated: 19 Feb 2020 12:55 by ADMIN
Release R1 2020 SP1
Created by: Jeff Cuddigan
Comments: 0
Category: AsyncUpload
Type: Bug Report

This issue is observed only in R1 2020. The solution is to not disable the FileAPI.

Reproduction steps:

    Telerik.Web.UI.RadAsyncUpload.Modules.FileApi.isAvailable = function () { return false; };
    Telerik.Web.UI.RadAsyncUpload.Modules.Flash.isAvailable = function () { return false; };
    Telerik.Web.UI.RadAsyncUpload.Modules.Silverlight.isAvailable = function () { return false; };
<telerik:RadAsyncUpload runat="server" ID="RadAsyncUpload1" ></telerik:RadAsyncUpload>

Last Updated: 15 Apr 2020 08:45 by ADMIN
Release R1 2020 SP1
Some HtmlChart appearance properties are not fully applied in R1 2020 (e.g. XAxis.MajorGridlines="false", ChartTitle.Appearance.TextStyle.Font, etc.)
Temporary workaround:
            var datavizThemes = kendo.dataviz.ui.themes || {};
            Telerik.Web.UI.RadHtmlChart.prototype.applyTheme = function () {
                var that = this,
                 kendoWidget = that.get_kendoWidget(),
                 themeName = kendoWidget.options.theme,
                 theme = datavizThemes[themeName];
                if (theme && theme.chart) {
Last Updated: 20 Jun 2020 17:08 by ADMIN
Created by: Doug
Comments: 1
Category: HtmlChart
Type: Bug Report
The XAxis.MajorGridLines of the chart YAxis are always visible as of 2020.1.114
Code to reproduce the issue:
<telerik:RadHtmlChart ID="RequestsMonthChart" runat="server" Height="500">
    <ClientEvents OnLoad="chartLoad" />
            <telerik:ColumnSeries Name="Series 1">
                    <telerik:CategorySeriesItem Y="30" />
                    <telerik:CategorySeriesItem Y="10" />
                    <telerik:CategorySeriesItem Y="20" />
        <XAxis Name="Year" DataLabelsField="Month">
            <LabelsAppearance RotationAngle="-35" />
            <MajorGridLines Visible="false" />
            <MinorGridLines Visible="false" />
                <telerik:AxisItem LabelText="Item 1" />
                <telerik:AxisItem LabelText="Item 2" />
                <telerik:AxisItem LabelText="Item 3" />
            <MajorGridLines Visible="false" />
            <MinorGridLines Visible="false" />
        <Appearance Visible="true" Position="Bottom" Width="500" />
    <ChartTitle Text="Requests Received by Month" />
Last Updated: 08 Jan 2020 12:20 by ADMIN
Release R1 2020

This bug started happening in version Telerik 2019.3.917, and is still present in Telerik 2019.3.1023.

The reproduction is extremely basic:

<table runat="server">
            <telerik:RadMonthYearPicker ID="MonthYear" runat="server" Width="150px">
            <asp:Button ID="btnGenerate" runat="server" Text="Get Report" OnClick="btnGenerate_Click" />

 protected void Page_Load(object sender, EventArgs e)
        if (!IsPostBack)
            MonthYear.SelectedDate = DateTime.Today;
            MonthYear.MaxDate = DateTime.Today.AddDays(1);

When i select a month/date from the control and submit the page i'm getting this script error:

The page freezes and i can get this error in Chrome from browser right-click->inspect->Console tab

Uncaught Sys.ArgumentUndefinedException: Sys.ArgumentUndefinedException: Value cannot be undefined.
Parameter name: handler
    at Function.Error$create [as create] (
    at Object.Sys._errorArgument (
    at Function.Error$argumentUndefined [as argumentUndefined] (
    at Function$_validateParameterType [as _validateParameterType] (
    at Function$_validateParameter [as _validateParameter] (
    at Function$_validateParams [as _validateParams] (
    at EventHandlerList$removeHandler [as removeHandler] (
    at Telerik.Web.UI.RadMonthYearPicker.remove_popupClosed (
    at Telerik.Web.UI.RadMonthYearPicker.dispose (
    at _Application$disposeElement [as disposeElement] (

You can see at the base of the call stack that the RadMonthYearPicker control is referenced. 

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