Bug report

Editor components throw AmbiguousMatchException when bound with models that have property shadowing in inheritance hierarchies.

Reproduction of the problem

1. Create a model hierarchy where a derived class shadows a base class property with new keyword
2. Bind the Editor component with the shadowed property
3. Exception is thrown during reflection

Current behavior

(optional)
The components should handle property shadowing gracefully and generate the appropriate HTML input element.

Expected/desired behavior

AmbiguousMatchException is thrown when trying to bind the component to the shadowed property.

TicketID:

1699473

Environment

• Kendo UI version: 2025.3.825
• Browser: [all]

I am working on a grid that has 3 requirements that seem to cause the bug:

• A FK column must have its lookup values loaded remotely
• The grid has sticky columns
• The grid is loaded inside a tab strip control

The combination of these 3 factors causes the grid not to load and results in a devtools console error. It's worth noting that removing any of the 3 bullet points above (e.g. NOT using sticky columns, NOT loading grid in tab control, or NOT have a remote FK column) allows the grid to load properly.

The error thrown in the DevTools console indicates that the grid's "tbody" property is not created at the time it is trying to call _setStickyStyles.

Before error is thrown (mouse is hovering over "tbody" property):

After error is thrown (look at console output):

I have upload a zip file containing a sample project that demonstrates the issue. When you launch the sample application, there are 2 links at the top of the page, "No Tabs" and "Tabs". The issue is reproducible on the "Tabs" page. Both pages use the same grid partial, but the "Tabs" page loads the partial through the tabstrip with a controller action. The "Tabs" page includes the 3 bullet points I indicated above that cause the problem.

The workaround I am using for now in my application is to NOT set the columns as sticky in my partial view. Instead, I set the sticky columns using the grid's API method "stickColumn" (https://www.telerik.com/kendo-jquery-ui/documentation/api/javascript/ui/grid/methods/stickcolumn) during the grid's dataBinding event (to ensure sticky columns are set AFTER grid initialization). This allows the grid to load and sets the sticky columns appropriately.

Thank you!

### Bug report

When building the scripts with NPM, there is syntax error "Unexpected number":

### Reproduction of the problem

Build the scripts (version 2025.3.812).

### Expected/desired behavior

The scripts must be built successfully.

### Workaround:

Remove the extra single quotes that wrap the version in the "rollup.mjs.config.mjs" and "rollup.modules.config.js" files:

• rollup.mjs.config.mjs

import glob from 'glob';
import path from 'path';
import { nodeResolve } from '@rollup/plugin-node-resolve';
import polyfill from 'rollup-plugin-polyfill';
import alias from '@rollup/plugin-alias';

...

const version = '2025.3.812';

• rollup.modules.config.mjs

import glob from "glob";
import path from "path";
import { nodeResolve } from "@rollup/plugin-node-resolve";
import polyfill from "rollup-plugin-polyfill";
import alias from "@rollup/plugin-alias";

...

const version = '2025.3.812';

### Environment

* **Kendo UI version: 2025.3.812

Currently, when dynamically appending menu items using the append() method, there is no built-in support to specify an icon via an icon, iconClass, or similar property — unlike other Kendo UI components such as kendo.ui.Button, which allow this directly.

To include an icon today, we must use inline HTML within the text property and set encoded: false, like so:

menu.append({
    text: '<span class="k-icon k-i-plus"></span> Add Item',
    encoded: false
});

While this workaround functions, it's not as clean or consistent as using a dedicated iconClass or icon option.

Please consider adding official support for an iconClass, icon, or similar property when using append() with kendo.ui.Menu, aligning it with how other Kendo components handle icons.

This would:

• Improve API consistency across Kendo components.
• Simplify code for dynamic menu updates.
• Eliminate reliance on raw HTML and manual encoding flags.

As stated in the title, the Save() action of a grid (with pagination, not endless scroll) does set the scroll position to the top instead of persisting it. 

I tried to follow instructions from https://www.telerik.com/aspnet-core-ui/documentation/html-helpers/data-management/grid/scrolling/overview#restoring-the-scroll-position but without success. The scroll position is moved to the top after the DataBound event handler.

Hi Team,

I would like to request to add an Html/Tag Helper for the kendo.ui.icon.  

Thanks!

I'm using an OData datasource to populate the grid.  To make matters worse, the Autocomplete retrieves data for *all* of the grid columns.  I'd say the default behavior should only retrieve the current column's data and preferably use OData groupby to limit the results to distinct values.

Interestingly, the CheckBoxList filter *is* populated from the current grid data, behaving as expected.  

My page is attached and the issue is occurring in the detail grid where Server Filtering is disabled.

Hi Team,

Currently, Telerik.Licensing NuGet package only has target for netstandard2.0, netframework462 and net6.0. I cannot use .NET 6 for my .NET 9 application because .NET 6 is out of support. 

This is a feature request to either

• Remove the net6.0 TFM and reply only on netstandard2.0
  • or
• Add net8.0 and net9.0 targets.

Thank you,

Arthur

I am seeing that once a grid checkboxlist column filter exceeds about 1000 items the wait time appears to increase non-linearly (performance is worse than linear.)  For example, with 3,000 items the page freezes for about 30 seconds.  The data is fetched in under 50 milliseconds, so the vast majority of this time appears to be processing by Kendo.

Please see the attached for my configuration.

Bug report

When enabling Editing for the Grid or TreeList a "No License" overlay is displayed in the following scenarios:

Reproduction of the problem

• Grid: overlay is displayed on load

@(Html.Kendo().Grid<TelerikMvcApp13.Models.OrderViewModel>()
    .Name("grid")
    .Columns(columns =>
    {
        columns.Bound(p => p.OrderID).Filterable(false);
        columns.Bound(p => p.Freight);
        columns.Bound(p => p.OrderDate).Format("{0:MM/dd/yyyy}");
        columns.Bound(p => p.ShipName);
        columns.Bound(p => p.ShipCity);
        columns.Command(c => c.Edit());
    })
    .Editable(e=>e.Mode(GridEditMode.PopUp))
    .Pageable()
    .Sortable()
    .Scrollable()
    .Filterable()
    .DataSource(dataSource => dataSource
        .Ajax()
        .PageSize(20)
        .Model(m=>m.Id(o=>o.OrderID))
        .Read(read => read.Action("Orders_Read", "Grid"))
        .Update(read => read.Action("Orders_Update", "Grid"))
        .Create(read => read.Action("Orders_Create", "Grid"))
        .Destroy(read => read.Action("Orders_Destroy", "Grid"))
    )
)

• TreeList: initially there is no overlay. Clicking on "Edit" button shows overlay and "No License" popup.

@(Html.Kendo().TreeList<Kendo.Mvc.Examples.Models.TreeList.EmployeeDirectoryModelPopUp>()
    .Name("treelist")
    .Toolbar(toolbar => toolbar.Create())
    .Columns(columns =>
    {
        columns.Add().Field(e => e.FirstName).Width(220).Title("First Name");
        columns.Add().Field(e => e.LastName).Width(100).Title("Last Name");
        columns.Add().Field(e => e.Position);
        columns.Add().Field(e => e.HireDate).Format("{0:MMMM d, yyyy}");
        columns.Add().Field(e => e.Phone).Width(200);
        columns.Add().Field(e => e.Extension).Width(140).Title("Ext").Format("{0:#}");
        columns.Add().Width(300).Command(c =>
        {
            c.CreateChild().Text("Add child");
            c.Edit();
            c.Destroy();
        });
    })
    .Editable(e => e.Mode("popup"))
    .DataSource(dataSource => dataSource
        .Create(create => create.Action("Create", "EmployeeDirectory"))
        .Read(read => read.Action("All", "EmployeeDirectory"))
        .Update(update => update.Action("Update", "EmployeeDirectory"))
        .Destroy(delete => delete.Action("Destroy", "EmployeeDirectory"))
        .Model(m =>
        {
            m.Id(f => f.EmployeeId);
            m.ParentId(f => f.ReportsTo);
            m.Expanded(true);
            m.Field(f => f.FirstName);
            m.Field(f => f.LastName);
            m.Field(f => f.ReportsTo);
            m.Field(f => f.HireDate);
            m.Field(f => f.Extension).DefaultValue(0);
            m.Field(f => f.Position);
        })
    )
    .Height(540)
)

Expected/desired behavior

No overlay and popup should be displayed in case of valid license.

TicketID:

(optional)
Provide the TicketID, where the bug report initiated.

Environment

• Kendo UI version: 2025.1.211

Serializing DataSourceResult when it contains several groups is significantly slower compared to serializing the object when no grouping is used. Consider ways to improve the performance. For more context and an example, see Ticket ID: 1677867.

In this screenshot, End Date and Subm Is Open are "nested" properties, and Prod Date and Is LatestVersion are *not* nested.  The row filter functionality is not displaying the correct row filter widget.

Here's a data sample:

The current demo is showing  a contains predicate. To enhance the current application, I am requesting the feature to use a starts with predicate to meet a practical business need. 

The minimum length property will need to changed to 1 to limit the number of characters to be typed.

It would be nice to extend dialog like office 365 right dialog ( docked to the right).

It would be nice to have a dropdown button with a container

In the example below products is actually DbSet<Product>

public async Task<ActionResult> Products_Read([DataSourceRequest]DataSourceRequest request)
{
    using (var northwind = new SampleEntities())
    {
        IQueryable<Product> products = northwind.Products;
        DataSourceResult result = await products.ToDataSourceResultAsync(request);
        return Json(result);
    }
}

Under the hood the ToDataSourceResultAsync call is executed inside Task.Run

And that Task.Run is calling sync methods of IQueryable which means EntityframeworkCore queries are not taking place with async I/O

Whilst I'm aware that I can create a HTML label and add the k-label class. I feel that a Label and a LabelFor are essential parts of the toolkit to prevent brittle code getting created when/if the labels that are created within the toolkit have other requirements

I have created my own implementation for now but I think this should be added to your roadmap, especially as it's such a simple thing to do