Telerik UI for ASP.NET Core Releases

TelerikUI & Visualization Suites.NET
Version 2026 Q3 (Aug 12, 2026)

Learn what's new across releases, with details of features, enhancements, and resolved issues.

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Telerik UI for ASP.NET Core 2026 Q3 (2026.3.811)Aug 12, 2026
Features
  • Common:
    • Added .NET 11 Preview 6 compatibility.
    • LLM Response Primitives.
    • jQuery Upgrade tool.
    • Added kendoKeydown event for components with keyboard navigation.
  • Dependencies:
    • Telerik Document Processing Library (DPL) version (2026.3.810).
    • Fluent Theme Package (v14.5.0).
    • Classic Theme Package (v14.5.0).
    • Bootstrap Theme Package (v14.5.0).
    • Default Theme Package (v14.5.0).
    • Material Theme Package (v14.5.0).
  • Drawer:
    • Improved developer experience of the Drawer component.
  • Editor:
    • Changing fontName or fontSize scrolls Inline Editor's content to the top.
    • Formatting marks not displayed for class initialized inline editors.
  • Grid:
    • Add k-sortable to Grid sortable columns.
    • Editor navigation prevented with stacked DataLayoutMode grid.
    • Grid Messages.Commands options are missing.
  • MultiSelect:
    • SelectAll option for MultiSelect.
  • Scheduler:
    • Readonly Events.
    • Breaking Changes:
      • Apply new table header rendering.
      • Redesigned Desktop Recurrence Editor.
      • Introduced "More Events" Popover in Month and Year views.
      • Responsive Desktop Events.
      • Redesigned Add/Edit dialogs.
      • Improved Scheduler Responsive Desktop Toolbar.
      • Scheduler redesigned.
  • SegmentedControl:
    • SegmentedControl Left and Right Arrow keyboard navigation support.
Fixes
  • ColorPicker:
    • kendo.parseColor throws on oklch parse attempt.
    • Error is thrown after destroy in ColorPicker.
  • ContextMenu:
    • Unable to open ContextMenu of scrollable Grid.
  • DateInput:
    • Unable to search/input selected months by typing first few letters in DatePicker.
  • DatePicker:
    • Unable to search/input selected months by typing first few letters in DatePicker.
  • DropDownTree:
    • Unexpected tokens in DropDownTree with checkboxes after dataSource read.
  • Editor:
    • Kendo Inline Editor adds linebreak after typing first character in Firefox.
    • Read-Only Editor clears pasted text, instead of not allowing paste at all.
    • Cannot read properties of undefined (reading '_destroyResizeHandles').
    • Dangerous Regex in the Editor's paste functionality.
    • Change event is fired when Inline Editor bound to Model.
  • Filter:
    • Missing kendo.binder dependency of Filter.
  • Gantt:
    • View type disappears with different width.
  • Grid:
    • Unable to open ContextMenu of scrollable Grid.
    • Editing in stacked layout Grid wtih detailedTemplate throws an error.
    • A row cannot be placed at last position in Grid with reorderable row enabled.
    • Tabbing on a Grid with locked column does not focus the next input.
    • Unable to localize Action Buttons of Adaptive Grid.
    • Incorrect recalculation of column widths in footer cells in the Kendo Grid component after resizing columns.
  • ListBox:
    • ListBox setOptions does not allow setting multiple selectable items.
  • MultiSelect:
    • MultiSelect - removing selected tag does not grab focus.
  • NumericTextBox:
    • NumericTextBox rejects valid decimal values.
  • Scheduler:
    • Scheduler calendar is not oriented correctly out of the box when direction of the wrapper is set to RTL.
    • Timeline view with RTL does not render the events correctly after dragging.
    • Class 'k-focus' is occasionally not cleared when changing views.
    • In selectable RTL Scheduler timeline jumps on clicking a timeslot.
  • Spreadsheet:
    • Spreadsheet columns cannot be resized.
    • Custom editor popup in spreadsheet closes immediately after opening.
    • Event handlers execution from clipboard paste in spreadsheet.
    • Applying freeze panes in Spreadsheet after scrolling resets scroll position and prevents navigation.
  • Window:
    • Window's containment with height as percent can break resizing.
Telerik UI for ASP.NET Core 2026 Q2 (2026.2.520)May 20, 2026
Features
  • Common:
    • Added Meridian Theme.
    • Added .NET 11 Preview 4 compatibility.
    • Added the ability to translate Kendo messages in all supported languages.
    • Loader Container overlay class changed from k-overlay-light to k-overlay.
    • Caret icons replaced with chevron icons.
    • Light and Dark theme colors removed globally.
    • Updated Telerik Document Processing Library (DPL) version to 2026.2.519.
    • Added support for Meridian Theme Package v14.1.0.
    • Added support for Fluent Theme Package v14.1.0.
    • Added support for Classic Theme Package v14.1.0.
    • Added support for Bootstrap Theme Package v14.1.0.
    • Added support for Default Theme Package v14.1.0.
    • Added support for Material Theme Package v14.1.0.
  • Button:
    • Button Size option type changed to accept xsmall, and ComponentSize changed to ButtonSize.
  • Chat:
    • Added Chat endless scrolling feature.
  • Dialog:
    • Removed Dialog themeColor option.
  • Form:
    • Added EditorTemplateViewFor in FormItemBuilder.
  • Gantt:
    • Gantt view selector changed from ButtonGroup to SegmentedControl.
  • Grid:
    • Added sticky groups.
    • Added row pinning.
  • MultiViewCalendar:
    • MultiViewCalendar Footer() should accept a boolean parameter ASP.NET Core.
  • PDFViewer:
    • PDFViewer Loader overlay class changed from k-overlay-light to k-overlay.
  • Scheduler:
    • Scheduler view selector changed from ButtonGroup to SegmentedControl.
  • Window:
    • Removed Window themeColor option.
Fixes
  • Avatar:
    • Fixed issue so that Avatar image URL can be escaped.
  • Chat:
    • Fixed Chat filesTemplate regression.
  • ChipList:
    • Fixed issue where you were unable to prevent ChipList select event.
  • ComboBox:
    • Fixed issue where the setOptions method of the ComboBox does not reset the height configuration.
  • ContextMenu:
    • Fixed missing class k-menu-group on ContextMenu ul element.
    • Fixed issue where aria-expanded false attribute set to Menu items with no child items unexpectedly.
  • DropDownButton:
    • Fixed issue where the DropDownButton API does not expose all configuration options for Popup customization.
  • DropDownList:
    • Fixed JS error thrown by adaptive DropDownList on resizing browser from mobile to desktop width.
  • Editor:
    • Fixed issue where Editor inside iframe resolves the wrong document object.
    • Fixed issue where export tool message is displayed as a tool title.
    • Fixed issue where Editor formatting creates redundant span element.
    • Fixed issue where Editor closes Source element tags.
  • FileManager:
    • Fixed issue where Filemanager filters folders after clearing the search.
  • Filter:
    • Fixed issue where using keyboard navigation does not focus elements in main Filter toolbar.
  • Gantt:
    • Fixed issue where Gantt events ending on 31st of December are not visible in Month and Year view in Firefox.
  • Grid:
    • Fixed issue where Grid CaseSensitiveFiltering is not working with EF database.
    • Fixed issue where a JS error is thrown when initializing an initially hidden stacked-layout Grid.
    • Fixed wrong position of Grid drop clue indicator k-reorder-cue in RTL.
  • Menu:
    • Fixed issue where aria-expanded false attribute set to Menu items with no child items unexpectedly.
    • Fixed issue where scrollable menu opens wrong menu on mobile.
  • PDFViewer:
    • Fixed PdfViewer table of content.
  • PivotGrid:
    • Fixed issue where an ampersand in column values prevents column from expanding.
  • PropertyGrid:
    • Fixed issue where PropertyGrid throws JS error because appearance properties are serialized with null values.
  • Scheduler:
    • Fixed issue where scrolling Scheduler when dragging events is not possible in RTL Scheduler.
  • Signature:
    • Fixed issue when using the Signature in a Wizard the drawing line is being offset.
    • Fixed Kendo Signature span between signature line and pen/mouse cursor.
  • Spreadsheet:
    • Fixed issue where you are unable to change Spreadsheet cell format via Format dialog.
    • Fixed issue where you are unable to translate the items in the DropDownButton for the Spreadsheet's sheet tabs.
    • Fixed issue where Spreadsheet filter icons do not respect rowHeight.
  • TaskBoard:
    • Fixed issue where TaskBoard tasks cannot be reordered in the same column.
  • TimeDurationPicker:
    • Fixed TimeDurationPicker label issues.
  • Tooltip:
    • Fixed issue where Tooltip is not recalculating its dimensions when the target text is changed.
  • Window:
    • Fixed incomplete typescript definitions for the Window title.
Telerik UI for ASP.NET Core 2026 Q1 (2026.1.415)Apr 15, 2026
Features
  • Common (Dependencies):
    • Telerik Document Processing Library (DPL) version (2026.1.402).
    • Fluent Theme Package (v13.1.1).
    • Classic Theme Package (v13.1.1).
    • Bootstrap Theme Package (v13.1.1).
    • Default Theme Package (v13.1.1).
    • Material Theme Package (v13.1.1).
  • Chat:
    • Adopted authored ref-promptbox-file-select-button, ref-promptbox-speech-to-text-button, and ref-promptbox-send-button in custom affixes without duplicating built-ins.
    • Routed the Chat file attachment button to the PromptBox start affix.
    • Forwarded PromptBox affix templates through Chat messageBox.
    • Made incoming messages near the bottom use threshold-aware scrolling while own messages still scroll to bottom.
    • Added autoScrollThreshold with pixel and percentage support for incoming message reveal.
    • Added Chat V3 and Q2 features to wrappers.
Fixes
  • Chat:
    • Fixed ChatOptions error in kendo.all.d.ts.
  • FileManager:
    • Fixed issue where setting the push event handler of the FileManager dataSource throws a JS error.
  • Gantt:
    • Fixed issue where Gantt with rowHeight and shown Planned tasks has misalignments.
  • MediaPlayer:
    • Fixed issue where ScrollView prevents Nested MediaPlayer volume scroller from scrolling.
  • MultiSelect:
    • Fixed issue where multiselect with Virtualization does not highlight all selected options in the drop-down menu.
  • PivotGrid:
    • Fixed issue where ampersand in column values prevents column from expanding.
  • PivotGridV2:
    • Fixed issue where PivotGridv2 does not calculate correctly Multiple measures with same type but different fields.
  • ScrollView:
    • Fixed issue where ScrollView prevents Nested MediaPlayer volume scroller from scrolling.
  • SmartPaste:
    • Fixed issue where CheckBoxGroup does not take data-smartpaste-description with higher precedence.
  • Stepper:
    • Fixed issue where Stepper connector lines do not connect to steps when zooming on iPad.
Telerik UI for ASP.NET Core 2026 Q1 (2026.1.212)Major versionFeb 12, 2026
Features
  • Common:
    • Added a new PromptBox Component.
    • Added a new AI Smart Paste Component.
    • Breaking Changes - Set default appearance to the components.
    • Updated Telerik Document Processing Library (DPL) version (2026.1.210).
    • Updated Fluent Theme Package (v.13.0.0).
    • Updated Classic Theme Package (v.13.0.0).
    • Updated Bootstrap Theme Package (v.13.0.0).
    • Updated Default Theme Package (v.13.0.0).
    • Updated Material Theme Package (v.13.0.0).
  • ButtonGroup:
    • Breaking Changes - Changed the default badge themeColor for ButtonGroup.
  • Chat:
    • Breaking Changes - Enhanced Chat Component capabilities.
  • Diagram:
    • Breaking Changes - Made Diagram Tooltips and Connection improvements.
  • Grid:
    • Added a new SmartBox tool.
  • Notification:
    • Added closeButton support to the Notification show and showText methods.
    • Breaking Changes - Changed the default type of notification in the show method.
  • TabStrip:
    • Breaking Changes - Removed k-item class from k-tabstrip-item element.
Fixes
  • Chart:
    • Fixed an issue where setting 'TemplateId' for the crosshair tooltip of the Chart's XAxis, YAxis or ValueAxis throws an exception.
  • Gantt:
    • Fixed an issue where Gantt Draggable and Group column builders throw exceptions when Sortable and Editor fluent overloads are used.
  • Grid:
    • Fixed an issue where adding template component in Grid toolbar results in watermark and licensing banner.
    • Fixed an issue where the Save changes and Cancel changes buttons do not appear on Grid.
    • Fixed an issue where the Save changes and Cancel changes buttons do not appear on Grids when clicking on a cell where edit is disabled.
  • Map:
    • Fixed an issue where using a WebAPI DataSource for a Map layer will throw an exception.
  • MediaPlayer:
    • Fixed the inaccurate MediaPlayer timeline on changing source via media method.
  • Menu:
    • Fixed an issue where setting the open-on-click enabled="true" Menu configuration without setting the scrollable configuration will throw an exception.
  • MultiSelect:
    • Fixed an issue where MultiSelect with autoClose true does not clear search value when an item is selected.
  • PivotGridV2:
    • Fixed an issue where Pivotgridv2 measure is not slicing the data by the second attribute when expanding.
  • Scheduler:
    • Fixed an issue where virtual Scheduler returns wrong resources in slotTemplate.
  • Slider:
    • Passing a Dictionary to ScriptAttributes throws an exception.
  • Spreadsheet:
    • When calling the Workbook.ToJSON method on a workbook document where all cells have AnyValueDataValidation the application crashes.
  • TabStrip:
    • Fixed an issue where TabStrip throws an exception when configuring tab action.
    • Fixed an issue where TabStrip with DOM DataSource rendering does not update contentUrls when updated through the options.
    • Fixed an issue where setting Encoded false is not respected - text in TabStrip tabs is always encoded.
  • TaskBoard:
    • Fixed an issue where TaskBoard will throw exception if no DataSource is specified for a Resource.
  • TreeList:
    • Fixed an issue where TreeList throws an exception when configuring a toolbar tool template.
Telerik UI for ASP.NET Core 2025 Q4 (2025.4.1321)Jan 21, 2026
Features
  • Common:
    • Added support for jQuery 4.0.0.
    • Updated Telerik Document Processing Library (DPL) version (2025.4.1319).
    • Updated Fluent Theme Package (v.12.3.0).
    • Updated Classic Theme Package (v.12.3.0).
    • Updated Bootstrap Theme Package (v.12.3.0).
    • Updated Default Theme Package (v.12.3.0).
    • Updated Material Theme Package (v.12.3.0).
  • Visual Studio Extension:
    • Added support for Visual Studio 2026 extensions.
    • Extended Visual Studio extensions with MCP configurations.
    • Added support for .NET 10.
  • Visual Studio Code Extension:
    • Extended VS Code extensions with MCP configurations.
    • Added support for .NET 10.
Fixes
  • Common:
    • Fixed "Unable to resolve dependency tree" error on npm install command in Kendo UI for jQuery source bundle.
  • MultiSelect:
    • Fixed issue where MultiSelect does not have a placeholder attribute.
  • PDFViewer:
    • Fixed issue where PDFViewer with DPL Processing loads blank document.