Learn what's new across releases, with details of features, enhancements, and resolved issues.
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Telerik UI for WinForms 2026 Q2 (2026.2.702)Jul 2, 2026
Features
Common:
The target framework-specific NuGet packages (UI.for.WinForms.AllControls.Net462/Net48/Net80/Net90) will be discontinued starting in Q3 2026. To reference a package containing all controls, use the multi-target Telerik.UI.for.WinForms.AllControls NuGet package instead.
Dependencies:
Updated Telerik Document Processing Library (DPL) version to 2026.2.624.
Fixes
RadNavigationView:
Fixed issue regarding a design time error message when using Property Builder in .NET Framework project.
RadPdfViewer:
Fixed exception: Could not load Microsoft.Web.WebView2.WinForms.
RadPropertyGrid:
Fixed issue where ReadOnlyAttribute is not respected when added to Attributes collection.
RadScheduler:
Appointments with a duration of less than 1 minute are not visible in RadPrintPreviewDialog.
RadSpreadsheet:
Incompatibility with Microsoft Excel of in-document Hyperlinks referencing worksheets with name containing spaces.
Worksheet name is editable when the workbook is protected.
RichTextEditor:
Underline color reset to black after export using RtfFormatProvider.
Visual Studio Extension:
WinForms Extension causes Visual Studio to crash.
Visual Studio 2026 becomes unresponsive when many files are saved.
Telerik UI for WinForms 2026 Q2 (2026.2.520)May 20, 2026
Features
What's New:
Telerik.WinForms.MCP is updated with project conversion tools.
Speech-to-Text integration and multiple other enhancements in RadChat.
Common:
The speech-to-text feature inside RadChat requires the WebView2. Ensure that your application includes the Microsoft.Web.WebView2 NuGet package as a dependency in order to use this functionality.
The target framework-specific NuGet packages (UI.for.WinForms.AllControls.Net462/Net48/Net80/Net90) will be discontinued starting in Q3 2026. To reference a package containing all controls, use the multi-target Telerik.UI.for.WinForms.AllControls NuGet package instead.
Updated Telerik Document Processing Library (DPL) version to 2026.2.519.
Updated minimum required Telerik Licensing version to 1.8.2.
AI:
Telerik UI for WinForms Converter (Preview) - new Roslyn-based conversion tools that transform standard Microsoft WinForms code (C# and VB.NET) to Telerik UI for WinForms equivalents. Integrated inside the Telerik.WinForms.MCP that exposes the tools as a guided, AI-driven migration workflow.
RadChat:
Improved input area with multiline text support.
Introduced reply functionality for responding to existing messages.
Integrated RadSpeechToTextButton for voice-to-text input.
Added support for file attachments.
RadRichTextEditor:
Introduced support for the HyperlinkClicked event to be raised when clicking on a hyperlink that points to a bookmark in the document.
Fixes
Infrastructure:
Removed the DPL AITools dlls from the AllControls NuGet package.
RadDropDownList:
Fixed issue where the AccessibleName property is not respected by the Windows Narrator.
Telerik UI for WinForms 2026 Q1 (2026.1.415)Apr 15, 2026
Features
What's New:
RadForm - Implemented UI Automation support.
RadTitleBar - Implemented UI Automation support.
RadPanel - Implemented UI Automation support.
RadRichTextEditor - Introduced support for raising the HyperlinkClicked event when clicking a hyperlink that points to a bookmark in the document.
.NET Core Designer - Added support for the .NET globalization invariant mode.
Common (Dependencies):
Telerik Document Processing Library (DPL) version has been updated to 2026.1.402.
The minimum required Telerik Licensing version has been updated to 1.8.2.
.NET Core Designer:
Added support for the .NET globalization invariant mode.
RadForm:
Implemented UI Automation support.
RadPanel:
Implemented UI Automation support.
RadRichTextEditor:
Introduced support for raising the HyperlinkClicked event when clicking a hyperlink that points to a bookmark in the document.
The UpdateViewPort method of the SelectionUILayer class is now virtual to support overriding.
RadScheduler:
Added a public property to control the status width for the AppointmentElement.
RadTitleBar:
Implemented UI Automation support.
Fixes
RadCheckedDropDownList:
Fixed issue where the CheckAllItem was hidden after scrolling to the bottom and then back to the top.
RadCommandBar:
Fixed issue where the CommandBarButton.Click event was incorrectly fired when clicking with the right or middle mouse button.
RadContextMenu:
Fixed issue where an incorrect pop-up size was displayed when the pop-up content was changed in the PopupOpening event.
RadDropDownList:
Fixed issue where the RadDropDownListArrowButtonElement.Click event was incorrectly fired when clicking with the right or middle mouse button.
RadGridView:
Fixed issue where right-clicking a child level of the hierarchy grid header causes an unhandled exception.
Fixed a missing GridHeaderCellElement.Sort() method.
Fixed issue where adding a new worksheet to an existing workbook in a GridViewSpreadExport scenario causes corrupted output.
Fixed issue where setting the EnableFiltering property to true leads to a NullReferenceException.
RadMenu:
Fixed issue where using a non-existing mnemonic key would type characters into the focused input control. Introduced a new PropagateNonMnemonicKeys property to control this behavior.
RadPdfViewer:
Fixed issue where incorrect values are displayed in the RadDropDownListElement editor drop-down list.
Fixed issue where a NullReferenceException is thrown when loading a PDF file with editing controls generated by the PDF24 website.
RadPropertyGrid:
Fixed issue where ExpandableObject was not working correctly with multiple selected items.
Fixed issue where the mouse was not released when double-clicking an item and resizing the description area.
RadRibbonBar:
Exposed the TextPrimitive property on RadRibbonBarGroup.
RadRichTextEditor:
Fixed issue where placing a bookmark and a hyperlink in a structured document tag disables the hyperlink's navigation.
RadTextBox:
Fixed issue where the AccessibleName property of the text box or masked edit box was not respected by Windows Narrator.
RadVirtualGrid:
Fixed issue where columns disappeared after navigating with the left/right arrow keys when pinned columns were present.
VSB:
Fixed issue where Visual Style Builder threw an error for a missing VbsRecoveryData file.
Telerik UI for WinForms 2026 Q1 (2026.1.210)Major versionFeb 11, 2026
Features
Common
Telerik Document Processing Library (DPL) version has been updated to 2026.1.210.
Minimum required Telerik Licensing version has been updated to 1.6.40.
New Controls
Added a new Speech-to-Text button.
RadMap
Added support for transparent images.
RadPictureBox
Added file path and image type information to the ImageLoaded event.
RadStepProgressBar
Added the StepClicked event to the control.
Fixes
RadRichTextEditor
Current editing style is not preserved when the document layout is refreshed.
Exception when pasting with 'Keep Source Formatting' if a style is missing from the document's style repository.
Exceptions occur when loading documents containing element tags without direct content that use opening and closing tags instead of self-closing tags.
Custom annotations are not rendered correctly when they have no content and are right-aligned.
Importing HTML that contains an image with an align attribute does not apply the alignment to the created image element in the document model.
Exporting documents (RadDocument) to .docx format produces an invalid file.
RadSpinEditor
When the NullableValue property is bound, the NullableValueChanged event is triggered even when the same value is applied.
RadSpreadsheet
Cannot unselect cells with the Ctrl key.
Telerik UI for WinForms 2025 Q4 (2025.4.1321)Jan 21, 2026
Features
Common:
Starting with the upcoming Q2 2026 releases, the following legacy themes will no longer be supported for new controls: Desert, Aqua, Breeze, Windows 7, Office 2007 (Black/Silver), Office 2010 (Black/Blue/Silver), Office 2013 (Light/Dark). Support for existing controls using these themes will remain unchanged.
Updated Telerik Document Processing Library (DPL) version to 2025.4.1319.
Updated minimum required Telerik Licensing version to 1.6.36.
RadGridView:
Added an option to select columns using checkboxes in the Column Chooser.
Improved sorting performance.
RadVirtualGrid:
Added a new sorting mode that disables the NoSort option.
Fixes
RadMaskedEditBox:
Fixed issue where DoubleClick event is not raised.
RadMultiColumnComboBox:
Fixed issue where the height of the grid in the popup becomes larger when it contains only one row.
RadPdfViewer:
Fixed issue where document hyperlinks do not scroll the page to their specified locations.
RadRichTextEditor:
Fixed issue where the BackColor property does not work in Web Layout mode.
RadTreeView:
Fixed issue where nodes disappear from the hierarchy when expanding another node and scrolling with the mouse wheel.
RadVirtualGrid:
Fixed issue where AddNewRow is not visible when the RowCount == 0.
TPF:
Fixed issue where a NullReferenceException is thrown during EndUpdate() under heavy Garbage Collector activity.
TPF Designtime Support:
Fixed issue regarding double serialization of the text and image properties in RadButton and RadLabel controls.