Telerik UI for WPF

Release History

UI for WPF R3 2019

September 18, 2019

What's New

  • Introduced Toolbox support (available with Nuget packages only) and Design time support for the .NET Core version of Telerik UI for WPF.
  • A new VisualStudio2019 theme which is inspired by the new refreshed Visual Studio 2019 IDE. It delivers a lot cleaner look and smoother feel to your WPF apps. With the VisualStudio2019 theme you will be able to deliver the best possible user experience that you encounter every day using the IDE to your own apps.
  • RadFilePathPicker - Introduced a new component which allows users to select a file or a directory from the file system or directly type the full path in the editor.
  • Introduced the beta version of RadSyntaxEditor - a useful text editor control which provides built-in syntax highlighting and code editing experience for popular languages. It also allows users to create custom syntax highlighting of keywords, comments, regions, operators, preprocessors and literals of their own language.
  • Introduced RadToggleSwitchButton which represents a switch and enables toggling between three states - Checked, Unchecked and Indeterminate. It consists of a toggle switch and two content areas, the visibility of which is controlled through a ContentPosition property.
  • Official RadWebCam - now the control can record video with sound, it provides new recording event and new properties for customization of the UI.

.NET Core

  • Introduced Toolbox support (available with Nuget packages only) and Design time support for the .NET Core version of Telerik UI for WPF.
  • In .NET Core, RadRichTextBox logic is combined in one assembly - Telerik.Windows.Controls.RichTextBox.

All Controls

  • Hyperlinks are now opened using Process.Start method through the Windows' command prompt for .NET CORE 3.0.


  • ArgumentException is thrown when FlipDuration is 0 and page is dragged for flipping.


  • The intellisense for the TextBoxStyle property does not display styles targeted to TextBox controls.
  • TabIndex property is not respected when the control is in editable mode.
  • Setting smaller than the default height of the control results to selected content being clipped in Office2013 theme.
  • When using IME (Chinese), first symbol is incorrectly processed.


  • Introduced EditorMode property to the DataFormDateField that determines the type of the created date control.


  • Introduced a constant for the selection rectangle inflation value.
  • Connection does not attach to gliding connector the first time it is dragged and dropped over the target shape.
  • The DiagramConstants.ContainerMargin constant does not apply properly in the ContainerShapes.


  • DocumentHost's selected pane Content has white foreground which conflicts with the white background of the panes in the Crystal theme and is therefore not visible.


  • IOException has thrown when creating a folder with RadOpenFolderDialog and move items.
  • Added text navigation in main pane. User can now select / navigate file or folders by entering their file names in the list view / details view.
  • ArgumentException is thrown when clicking in file / folder in details grid when filter and multiselection are used.
  • InvalidOperationException is thrown when setting theme using the StyleManager.SetTheme method on a RadFileDialog instance.
  • Rename doesn't work when double click on the selected file or folder in Details layout.
  • Sorting of the items is not consistent between left treeview (the navigation pane) and listview (the main pane).


  • Introduced "ShowGroupRows" property in GridViewDocumentExportOptions and GridViewSpreadStreamExportOptions for controlling whether groups' items should be exported.
  • Added support for setting Culture when exporting by using SpreadsheetStreamingExport.
  • Introduced the "IgnoreCollapsedGroups" property in the "GridViewSpreadStreamExportOptions" class for controlling whether collapsed groups' items should be exported.
  • The CellEditEnded event does not provide OldData and NewData argument values for GridViewMultiColumnComboBoxColumn.
  • CellEditEnded event is raised before the old data is restored when CancelCellEdit is invoked.
  • GridViewMultiColumnComboBoxColumn enters edit mode even when IsReadOnly or IsReadOnlyBinding is set to True.
  • A column can not be sorted by using touch when the user taps between the Content and the top border of the HeaderCell.
  • The edited row is visible after the user scrolls it out of view when all other rows are with Transparent background and GroupRenderMode is Flat.
  • Application Culture is wrong after exporting the grid with ExportToXlsx method.
  • The buttons for applying and clearing filters in the FilteringControl have fixed width which leads to their content being cut off in some cultures in the Windows8Touch theme. This fixed width is now removed. Consider defining a Style targeting the FilteringControl which changes its Width and/or MinWidth when applying different (more specifically bigger) font sizes.

Image Editor

  • The obsoleted MaxmimumMemoryBufferSize property was deleted. Use MaximumMemoryBufferSize property instead.


  • The listbox item gets the focus from the child input control when the Space key is pressed.
  • Clicking on an item that is partially visible horizontally triggers the logic to bring it into view vertically when using a VirtualizingWrapPanel.
  • RadListBox throws an exception when ScrollIntoView is called with index bigger than items count and either ScrollViewer.CanContentScroll is false or VirtualizingPanel.ScrollUnit is Pixel.


  • Improper text and currency symbol usage when culture is set to Russian ("ru-RU").


  • Implemented design time support for opening nested RadMenuItems.


  • A XamlParseException is thrown when the AutoCompleteMode property is set though Style.


  • Add IconTemplateSelector property for the RadNavigationViewItem.
  • Implemented PaneHeaderTemplateSelector and PaneFooterTemplateSelector properties.
  • Setting Foreground of NavigationViewItem is not correctly applied.

PDF Viewer

  • Scaling drop down's popup placement is incorrect.
  • NotSupportedFeatureException exception is now thrown for CCITTFaxDecode missing filters.
  • BookmarkItemStyle enum is renamed to BookmarkItemStyles.


  • Added support for Named Destinations.
  • Implemented import and export of ToUnicode CMap.
  • Implemented support for document outline (bookmarks).
  • ArgumentException is thrown when exporting text with negative font size using TextFormatProvider.
  • Embedding CIDFont with missing CIDToGIDMap property causes PDF/A warning in Adobe Preflight.
  • First level bullets are not visible.
  • Handled NotImplementedException when importing color with Lab colorspace.
  • InvalidCastException is thrown when importing a document with Named Destinations.
  • NullReferenceException is thrown in .NET Standard when importing a document with non-standard TrueType font.
  • TextBoxFields content text is wrong after importing and exporting fields with custom encoding in VariableContentWidget's font.


  • Implemented Culture property for QueryableDataProvider.
  • Implemented support for Week/Hour/Minute/Second steps in the QueryableDateTimeGroupDescription.
  • VerificationException is thrown when average aggregate function is applied.


  • Added the WindowLeft, WindowTop and WindowStartupLocation properties to the ModalEditor control which controls the window's location.


  • ApplicationButton's pressed state effect remains after closing Backstage in the Fluent theme.
  • Incorrect rendering of simplified state if it is turned on while the ribbon is minimized.
  • Tab does not get not selected when attempting to click in the exact center point of its corresponding header.


  • Exposed Paste Options allowing you to keep source formatting, keep text only, merge formatting or use destination styles.
  • ArgumentNullException is thrown when typing using Microsoft Pinyin IME.
  • Copy-paste TIFF or GIF image does not properly preserve the image.
  • DateFields are not updated when importing document.
  • EnableAsynchronousTextInsertion is not respected in a custom caret and any text input is now processed asynchronously.
  • FormattingColorPicker in text selection MiniToolBar occasionally throws binding errors on load.
  • InvalidOperationException is thrown when loading a document that contains styles with duplicate names that are based on one another when RTF document is imported.
  • NullReferenceException is thrown when showing ImageMiniToolBar with an image without data.
  • StreamFromUriResolving event is not fired for INCLUDEPICTURE fields in headers and footers.
  • In .NET Core, RadRichTextBox logic is combined in one assembly - Telerik.Windows.Controls.RichTextBox.


  • AppointmentExtensions.GetOccurences(source, dateSpan) method returns additional occurrences whenever there are exception occurrences.


  • NullReferenceException is thrown when importing documents containing an element with attribute with a nondefault namespace prefix.
  • Text that is overflowing the used cell range is wrongly clipped when printing or exporting to PDF.
  • Row heights with missing CustomHeight attributes in the document are ignored.


  • Text that is overflowing the used cell range is wrongly clipped when printing or exporting to PDF.
  • Wrapped text with specific column width is often rendered over the next cell.
  • "Cannot locate resource 'images/light/32/recommended_charts.png" exception is thrown when using the control with the .NET Core version of the assemblies.
  • Row heights with missing CustomHeight attributes in the document are ignored.
  • The obsoleted ProtectionButton is now deleted. Use RibbonButton control instead.


  • Creating new window is impossible when dropping the tab over control with AllowDrop = True.


  • MaximizeToggleButton remains visible and disabled when the MaximizeMode is Zero for the themes Green, Office2016, Office2016Touch, Material, Fluent and Crystal.


  • All groups disapper when GroupExpandMode is Multiple, runtime groups are added in DispatcherTimer and expand is performed extensively.


  • The tree list view holds a reference to an item removed from its source.


  • Introduced support for virtualization when the data is grouped. The feature is available in .NET 4.5 version of the controls.
  • Introduced support for container recycling for .Net Framework 4.5 or higher versions.


  • Support for text alignment in the arguments of the CellDecorationsNeeded event.
  • Introduced HeaderCellDecorationsNeeded event which can be used to modify the appearance of the header cell.
  • A NullReferenceException is thrown when there is no CurrentCell set and a Tab key is pressed.


  • Added AdditionalContent and AdditionalContentTemplate properties.
  • Added Clear command which can be used for clearing the text of the WatermarkTextBox.


  • Implemented a HasError property which indicates when the camera is in an error state.
  • WebCam does not work when WPF runs in software render mode (such as the case with Remote Desktop). The fix is available with the assemblies built against .NET 4.5 or above.
  • The FlipVertically and FlipHorizontally properties can get out of sync between the control and the MediaFoundation layer.
  • Calling the Initialize method causes the WebCam to hang.


  • RadWindow not maximized correctly on the secondary screen, when the secondary screen has higher resolution that the primary one and AllowsTransparency is False.
  • While dragging the size of the window changes when the DPI is 150 and higher.
  • Maximized Window gets clipped on dual monitor setup with the taskbar on the left/right and when AllowsTransparency is False.
  • The header buttons cannot be clicked and the Window is not correctly maximized on the second monitor when PerMonitor DpiAwareness is enabled.
  • Win32Exception is thrown when the AutomationManager AutomationMode is set to Disabled.


  • ArgumentException is thrown when exporting document with specifically nested tables.
  • ArgumentException is thrown when importing HTML document containing pseudo-element.
  • ArgumentException is thrown when importing HTML containing attributes with empty string values.
  • Export to PDF freezes when DefaultTabStopWidth is zero.
  • FormatException is thrown when importing HTML with img tag containing non-numeric "width" or "height" values
  • HtmlImportSettings.LoadFromUri event is not raised for stylesheet links without specified CSS type.
  • Hyperlinks are not properly exported to PDFs when their content is placed in a separate paragraph.
  • KeyNotFoundException is thrown when importing a document with an image defined as a resource but not found.
  • KeyNotFoundException is thrown when importing a document with an image with invalid or not supported extension.
  • The size of the image is wrongly calculated when width or height is not specified and the source is a URI or base64 string.

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