Release History

Telerik UI for WinForms 2026.4.1111 (2026 Q4)

November 11, 2026

What's New

NEW

• New RadInlineAIAssistant control to prompt an AI service from a text editor, stream responses, and insert or replace text in place. (docs)

Common

NEW

• Add VB project templates for modern .NET.
• Modernized and distributed through NuGet.org project templates. (docs)
• Telerik.CLI now supports WinForms create project command. (docs)

CHANGED

• .NET 8 and .NET 9 will remain supported for the next three months. Starting with the February 2027 release, support for these versions will end and the minimum supported version will be .NET 10.

Dependencies

• Telerik Document Processing Library (DPL) version updated to 2026.4.1109.
• Minimum required Telerik Licensing version updated to 1.11.3.

Installation and general issues

FIXED

• Preview distribution is cleaned up from unnecessary dependencies.

RadBrowseEditor

FIXED

• Tooltips are not displayed if you hover over the text box.

RadCalendar

FIXED

• WeekNumber is not correct when CalendarWeekRule.FirstFourDayWeek

RadChat

NEW

• Improve look of chat control.

RadDropDownList

FIXED

• Pop-up height is incorrect on the first time opening when the screen is scaled on high DPI.

RadForm

FIXED

• Incorrect size on DPI scaling greater than 100%.

RadGridView

FIXED

• Missing first keystroke in RadMultiColumnComboBoxElement.

RadInlineAIAssistant

NEW

• New RadInlineAIAssistant control. (docs)

RadMap

FIXED

• TargetInvocationException when closing its host tab/window while a tooltip is active or padding and releasing the mouse outside of the Form.

RadMessageBox

FIXED

• "Yes" button is cut off with the Material theme and 150% DPI scaling.
• When the RadMessageBox.Instance.AutoSize property is set to true each subsequent showing of the dialog increases its size.
• RTL cannot be set via the instance.
• The buttons bottom border is clipped in Windows11.

RadPivotGrid

FIXED

• Wrong subtotal is displayed for the top-level groups of a multi-level hierarchy when two or more row hierarchies follow it with AdomdDataProvider.

RadPropertyGrid

FIXED

• Hiding the "Sort" context menu item in the ContextMenuOpening event doesn't work.

RadRichTextEditor

FIXED

• Exposed MouseSelectionHandler and KeyboardSelectionHandler properties for better interaction.
• HTML import fails when an image has an align tag set to a value different from center.