Release History

Telerik UI for ASP.NET Core 2026.1.212 (2026 Q1)

February 12, 2026

Common

NEW

• New PromptBox Component
• New AI Smart Paste Component

Breaking Changes

• Set default appearance to components

Dependencies

• Telerik Document Processing Library (DPL) version (2026.1.210)
• Fluent Theme Package (v.13.0.0)
• Classic Theme Package (v.13.0.0)
• Bootstrap Theme Package (v.13.0.0)
• Default Theme Package (v.13.0.0)
• Material Theme Package (v.13.0.0)

ButtonGroup

Breaking Changes

• Change default badge themeColor for ButtonGroup

Chart

FIXED

• Setting `TemplateId` for the crosshair tooltip of the Chart's XAxis, YAxis or ValueAxis throws an exception.

Chat

Breaking Changes

• Enhanced Chat Component capabilities

Diagram

Breaking Changes

• Diagram Tooltips and Connection improvements

Gantt

FIXED

• Gantt Draggable and Group column builders throw exceptions when Sortable and Editor fluent overloads are used

Grid

NEW

• SmartBox tool

FIXED

• Adding template component in Grid toolbar results in watermark and licensing banner (8430)
• The Save changes and Cancel changes buttons do not appear on Grid (8424)
• The Save changes and Cancel changes buttons do not appear on Grids when clicking on a cell where edit is disabled (8423)

Map

FIXED

• Using a WebAPI DataSource for a Map layer will throw an exception

MediaPlayer

FIXED

• Inaccurate MediaPlayer timeline on changing source via media method (7060)

Menu

FIXED

• Setting the open-on-click enabled="true" Menu configuration without setting the scrollable configuration will throw an exception.

MultiSelect

FIXED

• MultiSelect with autoClose true does not clear search value when an item is selected (8429)

Notification

NEW

• Add closeButton support to Notification show and showText methods (8256)

Breaking Changes

• Change default type of notification in show method

PivotGridV2

FIXED

• Pivotgridv2 measure is not slicing the data by the second attribute when expanding (8226)

Scheduler

FIXED

• Virtual Scheduler returns wrong resources in slotTemplate (8381)

Slider

FIXED

• Passing a Dictionary to ScriptAttributes throws an exception

Spreadsheet

FIXED

• When calling the Workbook.ToJSON method on a workbook document where all cells have AnyValueDataValidation the application crashes (7935)

TabStrip

FIXED

• TabStrip throws an exception when configuring tab action
• TabStrip with DOM DataSource rendering does not update contentUrls when updated through the options (8425)
• Setting Encoded false is not respected - text in TabStrip tabs is always encoded (8416)

Breaking Changes

• Remove k-item class from from k-tabstrip-item element

TaskBoard

FIXED

• TaskBoard will throw exception if no DataSource is specified for a Resource

TreeList

FIXED

• TreeList throws an exception when configuring a toolbar tool template