Release History

Telerik UI for WPF 2026.3.812 (2026 Q3)

August 12, 2026

What's New

NEW

• RadSmartPasteButton is an AI-powered component that streamlines data entry by extracting structured information from clipboard content and automatically populating form fields. (docs)
• Telerik UI for WPF NuGet packages are now published on NuGet.org for easier discovery and consumption. (docs)
• Introduced RadInlineAIAssistant component - a floating, popup-based control that attaches to a text control, such as a TextBox or a RadRichTextBox, and provides inline AI-powered text editing capabilities. (docs)
• Telerik.CLI now supports Telerik UI for WPF breaking-change detection across C#, VB.NET, and XAML.
• Telerik.WPF.MCP is updated with a project upgrade tool that detects breaking API changes when upgrading Telerik UI for WPF versions.

Common

CHANGED

• Removed Telerik.Windows.MediaFoundation and MediaFoundation NuGet packages. Their binaries are now in the Telerik.Windows.Controls.Media NuGet.

Dependencies

• Minimum required Telerik Licensing version updated to 1.9.1.
• Telerik Document Processing Library (DPL) version updated to 2026.3.810.

Chat

FIXED

• Fixed binding errors for RadGlyph inside RadPromptInput / RadDropDownPopup (Cannot find source for binding with RelativeSource FindAncestor).

Docking

FIXED

• Panes are disappearing when the Docking is in Deferred mode.
• Unpining an active pane from a group causes the next pane to not be displayed correctly when the PaneActivationMode is set to Previous.

FileDialogs

FIXED

• Entering local path in breadcrumb while network path is loading does not switch to the local path.

FilePathPicker

FIXED

• DialogClosed event is not raised after the DialogType property gets changed.

GridView

FIXED

• Degraded performance in applications published as clickonce.

PDF Viewer

FIXED

• PDF Signature(image) is displayed on the incorrect location when using annotations.

PropertyGrid

NEW

• Add a mechanism to customize the label content (display name) of the property field.

RichTextBox

FIXED

• Duplicated default ListItem entry in the DropDownList content form on XAML import.
• Underline color reset to black after export using RtfFormatProvider.
• Keyboard commands (arrow keys, backspace, etc.) are not working for input controls hosted inside InlineUIContainer.
• NullReferenceException when importing docx document containing simple field without run in it.

Spreadsheet

NEW

• Introduce smart assistant that uses Document processing agent tools. (docs)

FIXED

• Wrong translations are present for some of the resource keys for the German language.
• Incompatibility with Microsoft Excel of in-document Hyperlinks referencing worksheets with name containing spaces.
• Save command doesn't commit the value of the currently edited cell before saving.
• Value is clipped or visualized out of the cell boundaries when the cell value is updated while it is in an inactive worksheet, and is referenced by another cell from the active sheet.
• Workbook property binding is failing when used in a DataTemplate.