Release History

Telerik UI for WinForms 2026.3.1007

October 7, 2026

What's New

NEW

• Copilot CLI Upgrade Plugin for modernizing existing projects. (docs)
• Upgrade Assistant tool inside Telerik WinForms MCP. (docs)
• Migrate command support in Telerik.CLI. (docs)
• Extended data annotations support in RadGridView. (docs)
• JPXDecode Filter support in RadPdfViewer.

Common

Dependencies

• Telerik Document Processing Library (DPL) version updated to 2026.3.1006.
• Minimum required Telerik Licensing version updated to 1.9.3.

AI

NEW

• Copilot CLI Upgrade Plugin which integrates with the Microsoft Upgrade Agent to modernize Telerik UI for WinForms applications. (docs)
• Telerik.WinForms.MCP is updated with a project upgrade tool that detects breaking API changes when upgrading Telerik UI for WinForms versions. (docs)

Licensing

NEW

• Added diagnostics detecting possible Telerik.Licensing.Runtime version mismatch in .NET Framework projects.

RadGridView

NEW

• RadGridView extends support for data annotation attributes for configuring column display, formatting, editability, and validation directly from the bound model. (docs)
• GridViewDataColumn.FormatString property should consider the DisplayFormatAttribute. (docs)

FIXED

• Column chooser scales multiple times on high dpi.

RadMap

FIXED

• Slow loading or missing tiles when using the OpenStreetMap provider.

RadPdfViewer

NEW

• Introduce support for JPXDecode Filter.

RadRichTextEditor

FIXED

• Мoving IncludePictureField in result display mode leads to losing the field and duplicating the image.

RadSpeechToTextButton

FIXED

• A network error is thrown when clicking on the button.

RadVirtualGrid

NEW

• Allow the NewRow to be moved to the bottom of a RadVirtualGrid. (docs)

Telerik CLI

NEW

• Telerik.CLI now supports Telerik UI for WinForms breaking-change detection across different Telerik versions in C# and VB.NET projects. (docs)

Theming

FIXED

• In the ControlDefault theme, editor cell text is misaligned while editing a cell