### Bug report

The Menu flickers on page load (i.e., when reloading the page, when navigating through the application pages).

### Reproduction of the problem

Attached is a demo that replicates the issue.

### Expected/desired behavior

The Menu should be rendered smoothly.

### Environment

* **Kendo UI version: 2022.1.412
* **jQuery version: 3.5.1
* **Browser: [all]

Bug report

Regression introduced with 2025 Q3

TabStrip with DOM DataSource rendering does not update contentUrls when updated through the options

Reproduction of the problem

1. Open the following Telerik REPL
2. Navigate to the Script.js tab
3. Notice that the options are explicitly changed.
4. Click on the second tab.
5. Notice that the content remains unchanged.

Current behavior

TabStrip with DOM DataSource rendering does not update contentUrls when updated through the options.

Expected/desired behavior

TabStrip with DOM DataSource rendering should update contentUrls when updated through the options.

Workaround

<script>
   $(() => {
      const tabStrip = $("#tabstrip").data("kendoTabStrip");
      tabStrip._contentUrls[1] = `~/shared/web/tabstrip/ajax/ajaxcontent1.html`;
  });
</script>

Environment

• Kendo UI version: 2025.4.1217
• Browser: [all]

Bug report

File Manager's toolbar overflow button does not show when the items are marked with the overflow setting.

Reproduction of the problem

1. Run the following dojo.
2. Set the overflow setting for one of the items in the Toolbar.

Current behavior

The overflow button is not displayed when one of the items is configured with the overflow setting.

Expected/desired behavior

The overflow button should be displayed when one of the items is configured with the overflow setting similar to the conventional toolbar widget's items.

Environment

• Kendo UI version: 2022.6.621
• Browser: [all]

Bug report

Even if a message file is added, the command buttons and the popup title in the Grid are not localized

Reproduction of the problem

1. Open the Dojo examples:

• Dojo with messages file - https://dojo.telerik.com/CehWjRrE
• Dojo with overriding the kendo.ui.Grid.prototype.options.messages - https://dojo.telerik.com/RWCxqxIm

2. Decrease the size of the screen so the Grid to be displayed in adaptive mode.
3. Click on a row and select the 'Edit' button to open the Edit popup

Current behavior

The command buttons and the dialog title are not localized:

Expected/desired behavior

It should be possible to change and localize the messages texts.

Workaround

 function onEdit(e){
      e.container.closest('.k-window').find('.k-window-title').text('My custom text')
      e.container.closest('.k-window').find('.k-button[ref-update-button]').text('Button Update Changed');
      e.container.closest('.k-window').find('.k-button[ref-cancel-button]').text('Button Cancel Changed');
 }

Environment

• Kendo UI version: 2025.4.1217
• Browser: [all ]

Bug report

Problem with ToTreeDataSourceResult method when filtering on root and child level.

Also applying filtering causes a significant slowdown in the query created by the ToTreeDataSourceResult method even when applied to small datasets.

Reproduction of the problem

Please refer to the code below and simply filter the first column with the value of 5.

//View
@(Html.Kendo().TreeList<WebApplication1.Models.SerialModel>()
        .Name("treelist")
         .Toolbar(toolbar => toolbar.Create().Text("New Level"))
        .Columns(columns =>
        {
            columns.Add().Field(e => e.RecordID).Width(280);
            columns.Add().Field(e => e.SerialNumber).Width(160);
            columns.Add().Field(e => e.Name);
            columns.Add().Field(e => e.Location).Width(200);
            columns.Add().Field(e => e.ParentID).Width(140);
            columns.Add().Command(c =>
            {
                c.CreateChild().Text("New Child");
                c.Edit();
                c.Destroy();
               
            }).Width(250);
        })
        .Editable(editable => editable.Mode("inline")).Filterable(true).Filterable(f => f.Extra(false))
        .DataSource(dataSource => dataSource
            .Read(read => read.Action("TreeListData", "Home"))
            //.ServerOperation(false)
            .Model(m =>
            {
                m.Id(f => f.RecordID);
                m.ParentId(f => f.ParentID).DefaultValue("0");
                
            })
        )
        .Height(540)
)

//Controller code: 
public ActionResult TreeListData([DataSourceRequest]DataSourceRequest request, int? id)
        {
            var source = Enumerable.Range(1, 5).Select(x => new SerialModel()
            {
                RecordID = x,
                SerialNumber = x,
                Name = "Name " + x,
                Location = "Location " + x,
                hasChildren =  true,
                ParentID = x < 5 ? 0 : (x / 5)
            });
            return Json(source.ToTreeDataSourceResult(request, e => e.RecordID,
                e => e.ParentID, e => id.HasValue ? e.ParentID == id : e.ParentID == 0, m => m));
        }

Expected/desired behavior

Instead of 1 record it returns 2 same items.

Filtering of the TreeList should be as fast as sorting.

Environment

• Kendo UI version: 2023.1.117

Currently, the text in the Grid commands can be customized in Kendo UI for jQuery using the following commands:

• https://www.telerik.com/kendo-jquery-ui/documentation/api/javascript/ui/grid/configuration/messages.commands

However, such options are missing in the wrappers. Thus, to customize the texts of the commands in the edit dialog, the elements must be modifed as in the example below:

 function onEdit(e){
      e.container.closest('.k-window').find('.k-window-title').text('My custom text')
      e.container.closest('.k-window').find('.k-button[ref-update-button]').text('Button Update Changed');
      e.container.closest('.k-window').find('.k-button[ref-cancel-button]').text('Button Cancel Changed');
 }

In addition, it will be good to have an option that will allow customizing the Edit Dialog text

Bug report

When the pasteHtml command or the paste method is used on a line that only has   or a tag these are deleted.

Reproduction of the problem

1. Run this Dojo
2. Press space a couple of times
3. Click the Add Module button
4. The spaces have disappeared

Alternatively, turn on Bold formatting without typing anything and click the Add Module button. The Bold formatting gets cleared

Expected/desired behavior

Pasting content in the Editor

Environment

• Kendo UI version: 2022.3.802

Bug report

Related to daylight saving: in the US on14 March, 2021, at 2:00AM the clocks are moved 1h forward.

Reproduction of the problem

Dojo example.

1. Set the computer's timezone to Pacific (US/Canada).
2. Double click the 2:00AM or the 2:30AM slot to add a new event.

Current behavior

The selection is moved 1h back to 1:00AM (or 1:30AM respectively) and the event is created at this time.

Expected/desired behavior

The event should be created at 3:00AM. This will be consistent with the way Outlook handles daylight saving - in a new meeting if you select 2:00AM as a start time, it is automatically changed to 3:00AM.

Environment

• Kendo UI version: 2021.1.224
• jQuery version: x.y
• Browser: [Chrome 88, IE11]

Bug report

When the setOptions of the Slider is applied with or without parameters the navigation of the Slider with the mouse breaks unless the resize() method is called immediately after.

Reproduction of the problem

1. Open this Dojo
2. Click the Without resize button
3. Navigate the Slider with the mouse

Note that even if the With resize button is subsequently clicked the behavior persists

Current behavior

Slider.setOptions() breaks mouse navigation of the Widget

Expected/desired behavior

Slider.setOptions() should call the resize method internally to prevent the issue

Environment

• Kendo UI version: 2021.2.616
• Browser: [all ]

Bug report

If a ListItem element contains a margin-left style, the user can not delete the bulleted item.

Reproduction of the problem

1. Go to this Progress Kendo UI Dojo.
2. Using case 1 in the code, attempt to delete a bulleted item using the backspace.
3. Using case 2, only the last bulleted item is using margin-left and will not be able to delete.

Here is a screencast of Case 1 in action.

Expected/desired behavior

The bulleted item should be deleted when the user presses backspace.

Environment

• Kendo UI version: 2020.3.1118
• Browser: all

Bug report

Similar to #5759. The issue is reproducible with mobile mode and vertical grouping enabled.

Reproduction of the problem

Dojo example: https://dojo.telerik.com/enaNotaZ/2

Current behavior

Misalignment between the group cells (e.g., Bob) and the day cells.

Expected/desired behavior

Properly aligned cells.

Environment

• Kendo UI version: 2023.3.1114
• jQuery version: x.y
• Browser: [all]

Hello Team,

when I add new folder then I rename it to 1.1 it show me 1.1.1 but the folder name is 1.1 and in properties 1.1 but I don't want it to show 1.1.1

the file manager add .1 automatically and if I rename it 2.2 it add .2 then the file display name 2.2 .

Please help,

Thank you,

Bug report

Reproduction of the problem

TelerikAspNetCoreApp98.zip

1. Run the attached project.
2. Focus the MultiSelect and type in "bu". The data is filtered and items matching the filter are displayed in the list.
3. Select the first item in the list
4. Type in "bu" again. The list shows the first "bu" item as selected (expected)
5. Scroll down the list, so that another page of the data is loaded
6. Now scroll up to the first item

Current behavior

The item is no longer highlighted as selected.

Expected/desired behavior

The item is highlighted as selected.

Environment

• Kendo UI version: 2020.2.513
• jQuery version: x.y
• Browser: [all]

Bug report

When a PDF file that contains PNG images is loaded in the PDFViewer that uses DPL, the PNG files are not displayed in the viewer.

Reproduction of the problem

1. Open this project(PDFViewerDPL.zip) and run it

Current behavior

An empty file loads in the PDFViewer while the loaded PDF file contains the logo of the Firefox browser.

Expected/desired behavior

The PDFViewer should display the Firefox logo loaded in the PDF file.

Environment

• Kendo UI version: 2020.3.1021
• jQuery version: x.y
• Browser: [all]

Starting with version 2025.2.520, the toolbar tools like "Save changes" and "Cancel changes" are hidden by default. When the ShowInactiveTools(true) option is set, the inactive tools are displayed as disabled until a change in the Grid's data is made (for example, the tools are active when the edited cell is closed).

Is it possible to create an option that enables the previous behavior of the inactive toolbar tools - to keep the tools always active and visible no matter if there is a change or not?

For example:

.ToolBar(toolbar =>toolbar
            .Items(itm =>
            {
                itm.Create();
                itm.Save();
            })
            .EnableInactiveTools(true)
)

Bug report

Gantt CurrentTimeMarker reappears after the Grid and Gantt tables are resized from the pane between them

Reproduction of the problem

1. Create a sample that contains the current date and time in it
2. Set the CurrentTimeMarker
3. Resize the Component
   

Current behavior

After the resize the marker reappears

Environment

• Kendo UI version: 2022.2.621

Using Telerik.Ui.for.aspnetcore version 2025.4.1111, when i create a grid 

                @(
     Html.Kendo().Grid<Land_Management_System.LASIViewModels.LASIMainRecordViewModel>()
     .Name("LASIGrid")
     .Height("auto")
     .Editable(x => x.Enabled(true)

     .Mode(GridEditMode.PopUp)
     .TemplateName("_LASITabStrip")
     .Window(x =>
     {
         x.Width("90vw").Height("90vh");
         x.Resizable().Scrollable(true);
         x.Actions(x => x.Minimize().Maximize().Close());
     })).Events(x => x.Save("onGridSave").Edit("onGridEdit"))

     .Columns(columns =>
     {
         columns.Bound(p => p.Id).Filterable(true).Visible(false);
         columns.Bound(p => p.LASIGuid).Title("LASI Ref No").Filterable(true);
         columns.Bound(p => p.UPRN).Title("UPRN").Filterable(true).Visible(false);
         columns.Bound(p => p.SiteLocation).Title("Site Location").Filterable(true);
         columns.Bound(p => p.Region).Title("Region").Filterable(true).Visible(false);
         columns.Bound(p => p.Pre2015Council).Title("Former NIHE District").Filterable(true).Visible(false);
         columns.Bound(p => p.SuperCouncil).Title("Super Council").Filterable(true);
         columns.Bound(p => p.AreaOffice).Title("Area Office").Filterable(true);
         columns.Bound(p => p.ParliamentaryConstituency).Title("Parliamentary Constituency").Filterable(true).Visible(false);
         columns.Bound(p => p.DevelopmentLimit).Title("Development Limit").ClientTemplate("#= DevelopmentLimit ? DevelopmentLimit.Name : '' #").Filterable(true);
         columns.Bound(p => p.Area).Title("Area").Filterable(true);
         columns.Bound(p => p.ReferenceType).Title("Reference Type").ClientTemplate("#=ReferenceType ? ReferenceType.Name : ''#").Filterable(true);
         columns.Bound(p => p.PlannerText).Title("Planner").Filterable(true);



columns.Command(command =>
{
    command.Custom("Edit").Click("showEdit");
    command.Custom("Details").Click("showDetails");

});



     })

.Filterable(filterable => filterable
        .Mode(GridFilterMode.Menu) // Enables per-column filtering
    )

     .Width("auto")
     .Pageable()

     .Groupable()
     .ToolBar(t =>
     {

             t.Create();
     })
     .Sortable()
     .Scrollable()
     .DataSource(dataSource => dataSource
     .Ajax()
     .Events(events => events.Error("grid_error_handler").RequestEnd("on_board_grid_request_end"))
     .PageSize(10)
     .ServerOperation(true)
     .Model(model =>
     {
         model.Id(p => p.Id);
         model.Field(prop => prop.Id).DefaultValue(0);
         model.Field(prop => prop.DevelopmentLimit).DefaultValue(new DevelopmentLimitViewModel());         
         model.Field(prop => prop.ReferenceType).DefaultValue(new ReferenceTypeViewModel());
         model.Field(prop => prop.Planner).DefaultValue(new UsersViewModel());
         model.Field(prop => prop.Category).DefaultValue(new CategoryViewModel());

         model.Field(prop => prop.TempUploadKey);

     })
     .Read(read => read.Action("LASIRead", "LASI"))
     .Create(create => create.Action("LASICreate", "LASI"))
     .Update(update => update.Action("LASIUpdate", "LASI"))

     )
     .NoRecords(true)
     )

when i try and create a new record the save button is disabled when it fails validation, when i complete the failed validation fields the button is not re-enabling

The FileManager triggers two Read requests when double clicking a folder in the ListView/GridView. The behavior can be observed in the Basic Usage Demo.

When navigationg to a folder in the TreeView using a single click, the component triggers a single Read request.

Could you consider optimizing the request handling when navigating to nested folders, particularly in ListView/GridView, to reduce redundant Read calls and improve performance?

Hello,

On Chrome for Android, the dropdown menu appears offscreen. With Firefox for Android or Chrome desktop, it works well.
This sample reproduces the problem : https://runner.telerik.io/fullscreen/@kakone/azuPAHuy. If you click on the right item (user icon), the dropdown appears offscreen.