In our UI for ASP.NET Core R3 2020 (2020.3.915) release, the Column menu message of unsticking a column is "null".

This bug will be resolved in our next official release.

In the meantime, as a workaround, manually set the Unstick Column menu message:

Using VS2026.

When I clone our project and then try to build it, I get this error:

Unable to load the service index for source https://nuget.telerik.com/v3/index.json. 
Response status code does not indicate success: 401 (Unauthorized).
 
In the "tools -> nuget package manager -> package manager settings -> nuget package manager -> configuration files", I see several nuget.config files.
The first nuget.config in the list is in located in the solution folder.
The second nuget.config in located in the "users\myname\AppData\roaming\nuget\" folder
The second nuget.config contains my nuget.telerik UID and PW. The first nuget.config does not have that info. Not sure if this matters or if I can switch the priority.
Also, I tried downloading my "telerik-license.txt" and placed it in my solution folder. Did not help.
Online it says to add source "https://nuget.telerik.com/v3/index.json" and use telerik UI and PW. Unsure where to do this.
I also removed then added the "Sources" through the VS2026 UI "nuget package manager -> sources", shown here. But I was never asked for a UID and PW as the articles online say would happen.
nuget.org	https://api.nuget.org/v3/index.json
TelerikOnlineFeed	https://nuget.telerik.com/v3/index.json
 
Also, when I open this solution in VS2026, a dialog appears asking to update "Telerik UI for ASP.NET Core version update". 
"Version Update" -> "Please, log in to download the latest version of Telerik UI for ASP.Net Core"
When I click the button, a web page appears saying I was successfully logged into telerik. When I return to VS2026, there is an error:
"Authentication did not succeed. Please try again"
 
How can I resolve this?
 

I am attempting to reference some CheckBoxes withing a RadGrid inside a PlaceHolder.

I have a field that I am retrieving called Block that contains a numerice value. Based on the value I am dynamically creating a number of CheckBoxes in a PlaceHolder equal to that value. I have a Button Click method that is trying to reference the CheckBoxes but it is not working correctly.

This line : Dim BlockCheckBox As CheckBox = DirectCast(phBlocksCheckBox.FindControl("BlockCheckBox_" & cbIndex), CheckBox) is not returning a value.

Good afternoon,

Using the demo https://demos.telerik.com/aspnet-core/grid/custom-command edited in REPL I have added some extra columns and grouping, plus a custom command whose visibility is conditional.

When I make the grid scrollable and contained in a div whose class is "container" the custom command column is hidden at runtime.

Index.html:

<div class="container">
@(Html.Kendo().Grid<Kendo.Mvc.Examples.Models.EmployeeViewModel>()
    .Name("Grid")
    .Columns(columns => {
        columns.Command(command => command.Custom("Close").Click("showDetails").Visible("colVisible"));
        columns.Bound(e => e.Title);
        columns.Group(group => group
            .Title("Name")
            .Columns(name => {
                name.Bound(e => e.FirstName).Width(80);
                name.Bound(e => e.LastName).Width(80);
            })
        );
        columns.Bound(e => e.FirstName).Width(80);
        columns.Bound(e => e.LastName).Width(80);
        columns.Bound(e => e.Title).Width(250);
        columns.Bound(e => e.FirstName).Width(80);
        columns.Bound(e => e.LastName).Width(80);
        columns.Bound(e => e.Title).Width(250);

    })
    .Size(ComponentSize.Small)
    .Scrollable()
    .Sortable()
    .Resizable(resize => resize.Columns(true))
    .DataSource(dataSource => dataSource
        .Ajax()
        .Read(read => read.Action("CustomCommand_Read", "Grid"))
     )
)
</div>
@(Html.Kendo().Window().Name("Details")
    .Title("Customer Details")
    .Visible(false)
    .Modal(true)
    .Draggable(true)
    .Width(300)
)

 <script type="text/x-kendo-template" id="template">
    <div id="details-container">
        <h2>#= FirstName # #= LastName #</h2>
        <em>#= Title #</em>
        <dl>
            <dt>City: #= City #</dt>
            <dt>Address: #= Address #</dt>
        </dl>
    </div>
</script>

Script.js:

   function showDetails(e) {
        e.preventDefault();

        var detailsTemplate = kendo.template($("#template").html());
        var dataItem = this.dataItem($(e.currentTarget).closest("tr"));
        var wnd = $("#Details").data("kendoWindow");

        wnd.content(detailsTemplate(dataItem));
        wnd.center().open();
    }

    function colVisible(dataItem) {
        var visible = dataItem.LastName == "Fuller";
        return !visible;
    }

Is there a way to make the custom command appear?  I guess that the width of the grid is being set by "container", I've predefined column widths of some of the columns, and it works out which columns appear before the visibility of the custom command is decided, so that appears behind the first Title column?

Kind regards,

Richard

I have a grid where I am using a custom grouping javascript event becuase one of the columns is using an editor template, when they group by that column, I want them to actually group by the hidden column containing the data for the column, not the ID.

When I drag the item to group it, the category name displays fine, having run through my javascript function.  

But when I click the three dots and use the column menu, and select Group, it uses the ID instead, and you can see that is what it is grouped by in the header. 

I suppose I could get around this by setting a custom group header for it?  I'm just not sure why it's by passing my javascript.

In this example
https://demos.telerik.com/aspnet-core/grid/ai-toolbar
It references 
.Service("https://demos.telerik.com/service/v2/ai/grid/smart-state")
However no code example or details of how to implement this 
 
Where do I find the code or documentation of how to implement

I feel like this should be simple but I can't figure this out.  I use the  [Display(Name = "Code")] annotation in my view model. I have a simple custom editor popup on my grid.  I use taghelpers because I just do.  I am trying to get my labels to show the display name in my popup.  I have seen older posts where validation is also not working but I think this has been fixed.  Either way I feel like this should work.

Model

 public class ChargeViewModel

 {
     [ScaffoldColumn(false)]
     public int ChargesID { get; set; }

     [Required]
     [UIHint("EditChargePopup")]
     [Display(Name = "Code")]
     public string ChargesCodeID { get; set; }

Custom Editor

<div class="col-4">
    <label for="ChargesCodeID" />
    <kendo-textbox for="ChargesCodeID" />
</div>
<div class="col-4">
    <label for="Charges_Name" />
    <kendo-textbox for="Charges_Name" />
</div>
<div class="col-4">
    <label for="Charges_Fee" />
    <kendo-numerictextbox for="Charges_Fee" format="c2" decimals="2" />
</div>

Results

I have created a fresh project with the following variables:

• Visual Studio 22 Community (Version 17.14.21 )
• Progress Telerik UI for ASP.NET Core Extension 2025.4.1110.199
• .NET 9.0
• Kendo UI v2025.4.1111

I am trying to create a simple grid as following that has an editable `DateTime?` column:

https://netcorerepl.telerik.com/GpFmvpEr29UDYPJN54

It works in the REPL link above, but if I press "Edit" on my local project, the DateTime column defaults to a text input without the datetimepicker buttons (see Attachment-1.png), I'm not sure what I am missing.

I've checked that `/Views/Shared/Editor/Templates/DateTime.cshtml` exists and the content is as follows:

@model DateTime?

@(Html.Kendo().DateTimePickerFor(m => m).HtmlAttributes(new { title = Html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName("")}))

I've placed either `[DataType("Date")]` or `[DataType("DateTime")]` annotation on the class property definition and neither worked.

I've used `.EditorTemplateName("DateTime")` and/or `[UIHint("DateTime")]` and it didn't work.

I've created a new Template type and it didn't work.

I'm not sure what else to try to make it work.

I am converting a MVC table grid to a Telerik Grid. While looking at it, there are conditional columns. For example: 

@if (Model?.GroupDetail?.IsMec == false)
                                    {
                                        <th class="text-secondary" style="width: 140px;">Group Info</th>
                                    }

<th class="text-secondary">
                                        @if (Model?.GroupDetail?.IsMec == false)
                                        {
                                            <text>Office</text>
                                        }
                                        else
                                        {
                                            <text>Role</text>
                                        }
                                    </th>