Release History

Telerik UI for WPF 2026.4.1110 (2026 Q4)

November 11, 2026

AI

NEW

• Copilot CLI Upgrade Plugin which integrates with the Microsoft Upgrade Agent to modernize Telerik UI for WPF applications.

Common

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.

Breaking Changes

• The AutoCompleteBoxExtensions class was removed. Use the TabNavigationExtensions class instead.
• The AddItemAdapter class was removed. Use AddItemAdapterCollection instead.
• Removed the obsoleted telerik:ValidationErrorTemplateHelper.ShowWhenFocused property. Instead, use telerik:ValidationErrorTemplateHelper.DisplayMode with the StaticOnFocus value.

Dependencies

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

BusyIndicator

FIXED

• IsBusy OneWay binding is not restored after unload/load cycle.

ColorPicker

Breaking Changes

• The RecentColorsVisibility property of RadColorPicker and RadColorSelector are removed. Use the IsRecentColorsActive property instead.

ContextMenu

Breaking Changes

• The Telerik.Windows.Controls.RadContextMenuAutomationPeer class was removed. Use Telerik.Windows.Automation.Peers.RadContextMenuAutomationPeer instead.

Docking

NEW

• Introduced support for using ScaleTransform in order to scale the control and its parts.

FileDialogs

Breaking Changes

• Removed the NaturalStringComparer class. Use local comparer / sorting method instead.

GanttView

NEW

• Introduce the creation of recurring tasks. (docs)

Breaking Changes

• Removed the ColumnWidth property of ColumnDefinition. Use the Width property instead. The InlineEditCommand property of GanttCommands static class was removed. Use the InlineEdit property instead.

Image Editor

Breaking Changes

• Removed the HeaderToUppercaseConverter converter. Use the UppercaseConverter instead.

Map

Breaking Changes

• Remove the obsolete classes related to the BingRestMapProvider.

Menu

Breaking Changes

• The SubmenuItemTemplateKey and SubmenuHeaderTemplateKey properties of RadMenuItem were removed. Use the Template property instead.
• The TopLevelHeaderTemplateKey and TopLevelItemTemplateKey properties of RadMenuItem were removed. Use the RadMenuRootItem element instead and set its Template.
• The SeparatorTemplateKey property was removed. Use the RadMenuSeparatorItem element instead and set its Template.
• The Telerik.Windows.Controls.RadMenuAutomationPeer class was removed. Use Telerik.Windows.Automation.Peers.RadMenuAutomationPeer instead.
• The Telerik.Windows.Controls.RadMenuItemAutomationPeer class was removed. Use Telerik.Windows.Automation.Peers.RadMenuItemAutomationPeer instead.

NavigationView

FIXED

• Sub-items are not visible when changing the view mode.

NotifyIcon

FIXED

• TooltipContentTemplate is not applied when UseNativeTooltip=False.

NumericUpDown

Breaking Changes

• The IncreaseButtonContentTemplate and DecreaseButtonContentTemplate properties of RadNumericUpDown are removed because they are not used in newer versions of the product.

PanelBar

Breaking Changes

• The IsDragDropEnabled property of RadPanelBar was removed because it is no longer used.
• The ItemsOptionListType property of RadPanelBar was removed because it is not used.
• The IsRadioButtonEnabled property of RadPanelBar was removed because it is not used.

PDF Viewer

NEW

• Introduce support for JPXDecode Filter. (docs)

FIXED

• Text elements have wrong vertical position in a document with flattened fields.
• COMException: 'Exception from HRESULT: 0x8052000C' breaks the printing of a specific document.

PivotGrid

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.

Breaking Changes

• Removed unused GetAggregateFunctionsForAggregateDescription and SetAggregateFunctionToAggregateDescription methods from the IDataProvider interface. Remove unused GenericDescriptionCollection class. Use Collection instead. Removed the Quarter property of the QueryableQuarterGroup class because it is not used. Removed the BooleanToAscendingSortOrderConverter and BooleanToDescendingSortOrderConverter classes. Use BooleanToSortOrderConverter instead. Removed the EnumToVisibilityConverter and EnumToBooleanConverter classes because they are duplicating with the same classes from the Telerik.Windows.Controls assembly.

RichTextBox

FIXED

• HTML import fails when an image has an align tag set to a value different from center
• Character properties of the paragraph symbol are exported to HTML for the whole list item when StyleExportMode is Classes.

Spreadsheet

FIXED

• Text Orientation is not reset when clicking on the options in the menu for a second time.

TabbedWindow

Breaking Changes

• One of the TabbedWindowCreatingEventArgs constructors was removed. Use the one with the draggItem parameter instead.
• The DraggedTab property of TabbedWindowCreatingEventArgs was removed. Use the DraggedItem instead.

TileView

Breaking Changes

• The HeaderTemplate property of the TileViewItemHeader class was removed. Use ContentTemplate instead.

TreeList

FIXED

• The indent of the row is not updated if an item is moved on another level of the data hierarchy at run-time.

TreeView

FIXED

• Fixed rendering issues when using Hierarchical virtualization mode and BringPathIntoView.

Breaking Changes

• The TargetName property of the TreeViewExpandCollapseAnimation class was removed. Use the AnimationTargetName property instead.