Last Updated: 25 Jun 2020 12:27 by ADMIN


<telerik:RadButton ID="RadButton1" runat="server" Text="Submit" EnableEmbeddedSkins="false" EnableEmbeddedBaseStylesheet="false"/>
<telerik:RadCheckBox ID="RadCheckBox1" runat="server" Text="CheckBox" Skin="Default" />


<telerik:RadButton ID="RadButton1" runat="server" Text="Submit" Skin=""/>


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: 30 Apr 2020 09:21 by ADMIN
Created by: Andy Green
Comments: 1
Category: Button
Type: Feature Request
Add custom Attribute to the RadRadioButtonList control.

By the way its not available as a control in the drop down.

Won't Fix
Last Updated: 22 Jan 2020 13:40 by Peter
An error is thrown when RadButton NavigateUrl is defined in content page with tilde and the master page is up one level.

Workaround: Remove the tilde from the navigate url.
Last Updated: 20 Jan 2020 11:08 by ADMIN
Created by: Ruth
Comments: 1
Category: Button
Type: Bug Report
Just updated the controls and as usual got bitten by the change.  Very simple, we had a button that changed colors based on a change in an edit page.  The Button remained a White Color if nothing was entered, a Green Color if the fields were all correct and a Red Color if the fields were in error.  The determining factor is all behind the seen analysis on a save which has nothing to do with the Button.  Code behind the scenes sets a db value for the status of the Button. We know that the status is being set correctly because activity allowed or disallowed occurs correctly and that the DB settings having been checked are 100% correct as well.

There are seven Buttons with 7 Entry Pages that are affected and the users are totally confused when there is no visual direction as to the problem.

How do we Fix the Button to change Colors
Last Updated: 20 May 2019 11:52 by ADMIN
Created by: Danail Vasilev
Comments: 5
Category: Button
Type: Feature Request
You can configure the confirm dialog through a ConfirmText property that defines the confirmation text. The boolean result can be exposed in the arguments of the click event. If there is a RadWindowManager on the same page a radconfirm should be used otherwise - the browser one.

For the time being the functionality can be achieved manually as illustrated in this demo - http://demos.telerik.com/aspnet-ajax/button/examples/confirm/defaultcs.aspx
Last Updated: 10 Apr 2019 14:30 by ADMIN
Last Updated: 17 Aug 2018 14:35 by Vasssek
Common scenario is to use PrimaryIconCssClass and SecondaryIconCssClass to decorate custom icons. Common situation is using bootstrap's classes for the glyphicons.

In order to workaround this you can use custom CSS rules and define the expected content properties for the before elements. This is an example with bootstrap icons (http://glyphicons.bootstrapcheatsheets.com/). 

    .rbSecondaryIcon.glyphicon-filter:before {
        content: "\e138";

<telerik:RadButton ID="RadButton2" runat="server" 
    Text="Filter" ButtonType="SkinnedButton" 
    Icon-PrimaryIconCssClass="glyphicon glyphicon-filter" >

Last Updated: 25 Jul 2018 07:43 by ADMIN
RadButton, RadPushButton and RadLinkButton can have a custom icon URL and CSS class.

When a CSS class is added, the background-image: url() rule is not rendered initially.

It does not matter what the class holds, it can even be empty

If you hover and leave the button, the icon shows up because the inline rule gets rendered.

The RadToggleButton does not manifest this behavior

You can find attached below a simple repro and workarounds
Pending Review
Last Updated: 28 Feb 2018 03:59 by S
Created by: S
Comments: 0
Category: Button
Type: Feature Request
Add table layout to radiobuttonlist control. this will facilitate the use of the control in a dynamic situation where you cannot predict  the number of columns the user wants to have. table layout is available in the standard ASP control and should be in the rad version as well. Furthermore it would make our flexibility increase if the item text of the list items can contain markup language (bold, or div with style) instead of latterly displaying the HTML code as if this was normal text.

Thanks for your great work and keep focus on ASP.NET controls to improve their funtions.
Last Updated: 20 Feb 2018 15:37 by Peter
Created by: Pero
Comments: 2
Category: Button
Type: Feature Request
Improve the SplitButton functionality so it is easier to use. Also provide a way for easier integration of ContextMenu with SplitButton as shown in the following demo: http://demos.telerik.com/aspnet-ajax/button/examples/splitbutton/defaultcs.aspx
Last Updated: 11 Oct 2017 14:04 by ADMIN
RadButton configured as an Image button cannot be clicked if a node from a RadTreeView is selected and EnableDragAndDrop property of the RadTreeView is set to true. The issue is reproducible in iPAD.

For the time being either the EnableDragAndDrop property of the RadTreeView can be set to false or the following JavaScript code can be placed after the declaration of the RadTreeView:

<script type="text/javascript">
                    var $T = Telerik.Web.UI;
                    Telerik.Web.UI.RadTreeView.prototype._onDocumentMouseUp = function (e) {
                        if ($telerik.isTouchDevice) {

                            if (this.longTouchID) {
                                this.longTouchID = 0;
                            this._treeTouchScroll._dragCanceled = false;


                        if (!this._dragging) {
                            this._initialDragMousePos = null;
                            this._initialDragNode = null;

                        var sourceNodes = this._sourceDragNodes,
                target = $telerik.getTouchTarget(e);

                        var destinationNode = null;
                        if (target == this._dropClue) {
                            // If the event has hit the DropClue we take the node it is attached to
                            destinationNode = this._dropClue.treeNode;
                        else {
                            destinationNode = this._extractNodeFromDomElement(target);

                        if (destinationNode) {
                            if (destinationNode._isDescendantOf(this._initialDragNode) || this._initialDragNode == destinationNode) {

                        var htmlElement = target;

                        var eventArgs = new $T.RadTreeNodeDroppingEventArgs(sourceNodes, destinationNode, htmlElement, this._draggingPosition, e);
                        this.raiseEvent("nodeDropping", eventArgs);
                        if (eventArgs.get_cancel()) {

                        htmlElement = eventArgs.get_htmlElement();
                        var command = this._getDropCommand(destinationNode, sourceNodes, htmlElement);

                        if (command.commandName) {
                            eventArgs = new $T.RadTreeNodeDroppedEventArgs(sourceNodes, e);
                            this.raiseEvent("nodeDropped", eventArgs);

Last Updated: 07 Jun 2017 14:35 by ADMIN
Implementing a fix for the Lightweight RenderMode is likely to cause regressions:
- https://feedback.telerik.com/Project/108/Feedback/Details/166590-fix-the-compatibility-of-radbutton-in-lightweight-with-image-in-cookieless-sessio
- https://feedback.telerik.com/Project/108/Feedback/Details/66505-fix-the-compatibility-of-radbutton-with-custom-image-that-contains-special-symbol

Thus, there are several workarounds:
- use the Classic RenderMode, if possible
- use the script below
- use CSS to set the icon instead of a property (example further down)

JS workaround:
			<telerik:RadButton runat="server" ID="rb1" RenderMode="Lightweight">
				<Icon PrimaryIconUrl="~/Circle_Green_20.png" />
			<telerik:RadPushButton runat="server" ID="rpb1" text="sample text">
				<Icon Url="Circle_Green_20.png" />
				function repaintButtons() {
					$telerik.$(".RadButton.rbIconButton, .RadButton.rbIconOnly").each(function (index, elem) {
						if (elem && elem.control && elem.control.repaint) {
					//uncomment this if you want the method to fire after each partial postback as well

CSS workaround:

			<telerik:RadButton runat="server" ID="rb1" RenderMode="Lightweight" CssClass="myCustomIcon" Text="some text">
				<Icon PrimaryIconUrl="Circle_Green_20.png" />
				.myCustomIcon .rbPrimaryIcon
					background-image: url(Circle_Green_20.png);
Last Updated: 07 Jun 2017 14:30 by ADMIN
The workaround is to override the background image of the button:


        .RadButton.RadButton_Default.rbLinkButton .rbPrimaryIcon {
            background-image: url("images/Groups (16x16).png");


       <telerik:RadButton ID="RadButton1" runat="server" ButtonType="LinkButton" Text="Click" Skin="Default">
            <Icon PrimaryIconUrl="images/myImage (16x16).png" PrimaryIconTop="2" PrimaryIconLeft="2" />
Last Updated: 02 Jun 2017 10:23 by ADMIN
Checkbox buttons are missing when ToggleType='CustomToggle' in Lightweight rendering. The issue is introduced in 2017 R1 release.

Code to reproduce:
        <telerik:RadButton runat="server" ID="btnEnableTrace" RenderMode="Lightweight"
            ButtonType="ToggleButton" ToggleType="CustomToggle">
                <telerik:RadButtonToggleState PrimaryIconCssClass="rbToggleCheckbox"></telerik:RadButtonToggleState>
                <telerik:RadButtonToggleState PrimaryIconCssClass="rbToggleCheckboxChecked"></telerik:RadButtonToggleState>
Last Updated: 01 Jun 2017 12:17 by ADMIN
The blue part of the radio and check buttons is gone in 2017.1.xxx. There is a slight hover highlight, but in general, it is drastically different from the previous version (2016.3.1303).

The new appearance can be seen at




as well as a comparison between before and after the new release in the attached screenshot.
Last Updated: 21 Apr 2017 14:10 by ADMIN
- Use the Lightweight RenderMode
- OR, use the RadCheckBox control instead

Steps to reproduce:

			<telerik:RadSkinManager runat="server" ID="rsm1" ShowChooser="true"></telerik:RadSkinManager>
			<telerik:RadButton ID="rbFileLink" runat="server" ToggleType="CheckBox" ButtonType="ToggleButton"
							   Checked="true" AutoPostBack="false">
Won't Fix
Last Updated: 27 Mar 2017 11:01 by ADMIN
This is a duplicate of http://feedback.telerik.com/Project/108/Feedback/Details/210060, see there for a workaround and for status updates.

You can change the DPI settings in Windows from the Display Settings. Setting a size of 125% and clicking on a button will throw a server exception:


Input string was not in a correct format.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.FormatException: Input string was not in a correct format.

Source Error: 
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 
[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +12526913
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +120
   Telerik.Web.UI.RadImageButton.LoadPostData(String postDataKey, NameValueCollection postCollection) +256
   Telerik.Web.UI.RadWebControl.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +16
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +457
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1833
Under Review
Last Updated: 22 Mar 2017 18:35 by Yasha
When multiple RadButtons (ButtonType="ToggleButton" ToggleType="Radio") are grouped through GroupName property, the server-side property checked doesn't take effect when the button which is to be checked is declared before the current checked button.

The workaround is to execute JavaScript from the server which sets the checked property. For example:


        string script = "function f(){$find(\"" + RadButton1.ClientID + "\").set_checked(true); Sys.Application.remove_load(f);}Sys.Application.add_load(f);";
        ScriptManager.RegisterStartupScript(this, this.GetType(), "key", script, true);

Pending Review
Last Updated: 02 Feb 2017 11:59 by ADMIN
Created by: Marin Bratanov
Comments: 0
Category: Button
Type: Bug Report
select an item from the dropdown, different than "1"
expected: buttons become enabled
actual: radbutton is still disabled

        <asp:Button ID="ButtonTest" runat="server" enabled="true" Text="Test" EnableViewState="False" />
        <telerik:RadPushButton ID="RadButtonTest" runat="server" Text="RadButtonTest" Enabled="True" EnableViewState="False" RenderMode="Lightweight"></telerik:RadPushButton>
        <asp:DropDownList runat="server" ID="DropDownTest" AutoPostBack="True" OnSelectedIndexChanged="SelectedIndexChanged_Test">
                <asp:ListItem Text="1" Value="1"></asp:ListItem>
                <asp:ListItem Text="2" Value="2"></asp:ListItem>
                <asp:ListItem Text="3" Value="3"></asp:ListItem>
                <asp:ListItem Text="4" Value="4"></asp:ListItem>

		protected void Page_LoadComplete(object sender, EventArgs e)
			if (DropDownTest.SelectedValue == "1")
				ButtonTest.Enabled = false;
				RadButtonTest.Enabled = false;
				string script = string.Format("function f(){{$find('{0}').set_enabled({1});Sys.Application.remove_load(f);}}Sys.Application.add_load(f);",
				ScriptManager.RegisterStartupScript(Page, Page.GetType(), "someKey", script, true);

		protected void SelectedIndexChanged_Test(object sender, EventArgs e)
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