Bug report

Reproduction of the problem

1. Open the Dojo - https://dojo.telerik.com/tLeSgMPo
2. Create a new event
3. Drag and drop it over the existing one

Current behavior

The events overlap

Expected/desired behavior

The events should be deisplayed one below each other.

The issue is a regression starting with 2023.2.606

Environment

• Kendo/Telerik version: 2026.2.520
• Browser: [all ]

Bug report

Reproduction of the problem

1. Open this dojo - https://dojo.telerik.com/YupCowEr

1. Add a new item to the Grid

1. Click 'Save Changes'

1. Add another item to the Grid

1. Click 'Cancel Changes'

Current behavior

The last saved item is moved to the end of the Grid

TicketID:

1716706

Environment

• Kendo/Telerik version: 2026.2.520

Bug report

Reproduction of the problem

1. Open the Dojo - https://dojo.telerik.com/VGCfaixF
2. Select the month part and start typing first letter of a February, April, June, September or November months.

Current behavior

The mentioned months not selected. However, some months such as Jan, July are selected as expected.

Expected/desired behavior

All the months should be filtered/selected when typing first letters

The issue is a regression starting with 2024.4.1112

Environment

• Kendo/Telerik version: 2026.2.520
• Browser: [all ]

Bug Report

When the Grid is exported with child columns hidden with Multi-column headers, the columns headers are not exported.

Reproducible

1. Go to this Progress Kendo UI Dojo
2. Export the Grid

Current Behavior

The column headers do not all export:

Expected Behavior

The Grid should export all column headers like when they are not hidden - Dojo :

Workaround

Explicitly set the parent column's exportable configuration to true - Dojo:

$("#grid").kendoGrid({
    columns: [
        { field: "name", title: "Name" },
        {
            title: "Address",
            exportable: true,  //set to true 
            columns: [
                { field: "street", title: "Street", hidden:true, exportable: true },
                { field: "city", title: "City", hidden:true, exportable: true }
            ]
        },
        { field: "phone", title: "Phone" }
    ]
    //....
});

Environment

Kendo UI version: 2026.2.520
jQuery version: 4.0.0
Browser: all

Hi there, 

I am using Kendo UI version 2026.2.520. I have a gantt chart and the view options (day, week, month etc.) disappears when I change the width of the chart. However, when I change the version to 2025.2.520, the same width shows the view types. Is there some way to solve this issue so it was working as it previously did?

Here is the dojo I used

https://dojo.telerik.com/KQpoYmVQ 

Bug report

Current behavior

Errors during build process:

(replace-metadata plugin) [SOURCEMAP_BROKEN] Sourcemap is likely to be incorrect: a plugin (replace-metadata) was used to transform files, but didn't generate a sourcemap for the transformation. Consult the plugin documentation for help: https://rolldown.rs/guide/troubleshooting#warning-sourcemap-is-likely-to-be-incorrect

Expected/desired behavior

There should be no errors

TicketID:

1716119

Bug report

Reproduction of the problem

1. Open the Dojo - https://dojo.telerik.com/guOqNNgh
2. Edit a row and save the new value

Current behavior

An error: kendo.grid.js:16278 Uncaught TypeError: Cannot read properties of undefined (reading 'field')

Expected/desired behavior

No error should be thrown. It should be possible to use detailedTemplate along with the stackedLayout

TicketID: 1715859

Environment

• Kendo/Telerik version: 2026.2.520
• Browser: [all ]

Bug report

Reproduction of the problem

When the diagram is zoomed the click event is not fired when clicking on shapes.

1. Open this dojo - https://dojo.telerik.com/iALWmVGY
2. Zoom diagram out
3. Click on a shape

Current behavior

Click event is not fired.

Expected/desired behavior

Click event should be fired when clicking on a shape in zoomed out diagram

TicketID:

1715835

In Kendu UI 2026 Q2 (version 520) file kendo.all.d.ts

The interface IChatOptions has a duplicate defintion for the messageTemplate

Line 3849:

messageTemplate?: MessageTemplateFunction | null;

Lines 3916/3917   

/** Template for rendering individual messages */
messageTemplate?: MessageTemplateFunction | null;

Hi,

I've followed your AI integration example but I noticied that when I use the updateMessage method for some reason the chat scroll move toward the start of the message. Maybe I'm wrong but looking at the source code I think that the problem is the chat-widget.js inside this method

_refreshStandardSync(message, isOwnMessage, wasNearBottom) {
        if (!message) {
            return;
        }
        this.renderMessage(message);
        if (isOwnMessage) {
            this.scrollToBottom();
        }
        else if (wasNearBottom && message.uid) {
            this.view.scrollIncomingMessage(message.uid);
        }
    }

$("#copilotChat").kendoChat({
	authorId: "user",
	height: "100%",
	messageBox: {
		mode: "auto"
	},
	fileAttachment: false,
	speechToText: false,
	messageWidthMode: "full",
	skipSanitization: true,
	sendMessage: function (e) {
		if (e.generating) {
			//cancelling request, code omitted
		}
		else {
			//new request, code omitted
		   
		}
	}
});

//receive message via SSE (code omitted)

const chat = $("#copilotChat").data("kendoChat");
let messageObject = chat.dataSource.get(params.runId);

dashboardProposal.currentCopilotChatText += params.content;
if (messageObject) {
	const markdown = markdownInstance.parse(dashboardProposal.currentCopilotChatText);
	chat.updateMessage(messageObject, { text: markdown });
}
else {
	chat.postMessage({
		authorId: "assistant",
		authorName: app.i18n("advice_dashboardProposal_authorNameCopilot"),
		text: params.content,
		id: params.runId
	});
}

Bug report

Reproduction of the problem

Run this dojo - https://dojo.telerik.com/MkKhDjxX

The results are different when using the same values in Excel.

Current behavior

Result comparison for cells with numeric values

Result comparison for cells with text values

TicketID:

1715542

Environment

• Kendo/Telerik version: 2026.2.520

Bug report

Reproduction of the problem

1. Run this dojo - https://runner.telerik.io/fullscreen/aKRBlRDR
2. Quickly change the views in no particular order

Current behavior

Occasionally the k-focus class is not cleared from a previously selected view.

Expected/desired behavior

The k-focus class should be cleared

TicketID:

1715639

Environment

• Kendo/Telerik version: 2026.2.520

In some scenarios, the PDFViewer does not show the correct end page in its toolbar.

I have a file with 73 pages; some of the pages have different sizes.

Current behavior: When I load the file in the PDFViewer and click the 'Last page' button, there is a slight moment where the correct page number is displayed (73), but after that it is changed to 71.

Expected behavior: The correct page number should be displayed when clicking the 'Last page' button.

Bug report

Reproduction of the problem

1. Open the Dojo - https://dojo.telerik.com/IbJSAmGX
2. Try to reorder the rows and place for example row 1 below row 5

Current behavior

No row can be placed below row 5.

Expected/desired behavior

It should be possible to reorder and place a row at last possition

The issue is a regression starting with 2026.1.415

Environment

• Kendo/Telerik version: 2026.2.520
• Browser: [all ]

This problem can be easily demonstrated by looking at the page on the demonstration page, and then copying and pasting the same code into the kendo dojo.

The official demonstration page displays the buttons like so:

But the same code on the dojo displays the buttons like so:

As you can see, the demonstration page has a consistent style for all of the buttons, while the dojo page does not.

Both pages have the same classes on the icons:

• k-svg-i-caret-alt-to-left
• k-svg-i-chevron-left
• k-svg-i-chevron-right
• k-svg-i-caret-alt-to-right
  
  

The mixture of styles gives an unprofessional impression to the customer, and is preventing me from upgrading my codebase from version 2025.4.1321

For the simplest possible example, see this dojo snippet: https://dojo.telerik.com/aroNDBBv

Bug report

Reproduction of the problem

1. Open the link in Firefox - https://demos.telerik.com/kendo-ui/editor/inline-editing .
2. Select and delete all the text in one of the inline editors.
3. Type any two (or more) characters to reproduce the issue.

Current behavior

If the user begins typing a word into the editor, the first character is automatically wrapped in a <p> tag.

Expected/desired behavior

The behavior between the browsers should be consistent. There should be no additional <p> tag.

Workaround: https://dojo.telerik.com/usTyJAmt/3

Environment

• Kendo/Telerik version: 2026.2.520
• Browser: [all ]

This is an enhancement request.

Wizard buttons can be modified via the activate event and replaced with a fully initialized Button, but it would be better to just offer more of the Button properties right on the wizard steps.buttons object properties.  For example, the icon/image properties, fillMode, size, etc.

Bug report

Reproduction of the problem

We noticed this issue on our client application. It is especially prominent on a slower network connection. We have a batch edit Grid (in cell editing). We clicked Add to create a new row, added data to it, double-clicked the Save Changes button, refreshed the page, and noticed we had 2 new entries instead of just 1 in the grid. We are currently using v2025.4.1111.

To make sure that it was not something isolated to our specific version / setup, I went to the Kendo grid demo site (https://demos.telerik.com/kendo-ui/grid/editing ) to try and reproduce. At the time of writing this ticket, the Kendo site used the latest version available, v2026.2.520.

Current behavior

The following steps reproduce the issue reliably.

1. Open the DevTools console
2. Click the Network tab and change the network throttle to be "Fast 4G"
3. Click Add in the Grid
4. Type in the cells
5. Click Save Changes several times rapidly
6. Observed multiple "Create" network calls in the DevTools Network tab
7. Refresh the page to see multiple "test567" entries in the Grid

TicketID: 1715189

Environment

• Kendo/Telerik version: Latest
• jQuery version: All
• Browser: [all]

Bug report

Reproduction of the problem

1. Open the https://dojo.telerik.com/SSFszYRK or https://dojo.telerik.com/yYFBekrt
2. Copy some text
3. Select part of the text in the Editor and try to paste using Ctrl + V

Current behavior

Currently, the highlighted (selected) text dissapers.

Expected/desired behavior

The selected text should not dissapear and the content of the Editor should remain unchanged.

Workaround

kendo.ui.editor.Clipboard.fn.onpaste = function(){
        if (this.editor.body.contentEditable === "false" || this.editor.body.contentEditable === "inherit" ) {
          return;
        }
      }

Environment

• Kendo/Telerik version: 2026.2.520
• Browser: [all ]