Release History

Telerik UI for Silverlight is Retiring

Driven by the evolution of technology and industry standards, Progress Software is deprecating Telerik UI for Silverlight effective December 1, 2023. Technical support and critical fixes will be available until December 1, 2024.

UI for Silverlight R2 2018

May 16, 2018

What's New

  • Animations for chart series in RadChartView.
  • Format painter in RichTextBox.

All Controls

  • Included NuGet packages as part of the weekly internal builds.
  • Introduced separator support for UpperCaseConverter via ConverterParameter.


  • AsyncFilteringBehavior can lead to OperationCanceledException.


  • Added series and point animations to chart series. It is now possible to animate the paths which define the series and datapoints with various animations like move, scale, reveal, fade.


  • InputGestureText does not inherit VerticalContentAlignment from RadMenuItem in all themes.


  • NumericButton stays checked after canceling the PageIndexChanging event.


  • InvalidOperationException for logical child when Small/Large/Normal content is set to a Visual which has other logical parent.


  • FilterDescriptor now respects Globalization.Culture. Use one of the new constructors with CultureInfo cultureInfo parameter.
  • Implemented CanUserGroupColumns property.
  • GridViewComboboxColumn now supports EmptyText.
  • Disable group expand behavior on PropertyChanged.
  • Selecting multiple sorted items with Extended SelectionMode hangs the UI.
  • Adding items with newline content displaces the vertical scrollbar, if there are multiple items with variable height.
  • InvalidCastException is thrown when the type of the Count of the Queryable source is long.
  • ColumnGroupHeader does not get generated for columns with DisplayIndex.
  • NullReferenceException in the FlatLayoutStrategy.ScrollRowIndexIntoView.
  • A NullReferenceException could be thrown in PrepareCellToolTip after entering in Edit mode.
  • DisplayMemberPath of GridViewComboboxColumn should be copied rather than SelectedValueMemberPath when DataMemberBinding is a nested property.
  • SelectedItem is not updated properly in a grouped scenario.
  • The vertical scrollbar jumps when adding items with newline content.


  • The Bounds of the ClusterData's object has wrong East value when AutoCalculateBounds is True.
  • Toolbar is misplaced when CommandBarVisibility is set to Collapsed in VisualStudio2013, Office2013 and Windows8 themes.


  • Implemented built-in Regex validation through the ValidationRegex property of RadMaskedTextInput. Include couple of predefined Regex strings (for IP and Email), located in the ValidationHelper class.
  • Caret does not move when trying to replace the symbol after a literal symbol in ReplaceMode.


  • Implemented IsContentPreserved property for preserving the content of the selected tabs.

PDF Viewer

  • Glyphs are rendered with wrong stroke width.
  • Text is blank when the file contains a reference to a font that is not included in the file.
  • Missing form fields caused by handled exception during RadioButton options import.
  • Unexpected geometries are drawn when a PDF file contains not immediately stroked closed geometries.
  • TextField font size is different when typing and when applying the input value.
  • Missing content due to font defined using empty string for FontFamily in its font descriptor.
  • VariableContentWidget UI controls are invisible in Fluent, Green, Material and Office2016 themes.


  • Implemented import of SC and SCN content stream operators for all color spaces.
  • Implemented import and export of DeviceN color space.
  • Implemented import and export of Separation color space.
  • Implement import for "K" and "k" CMYK color space operators.
  • Implemented import and export for all PDF function types.
  • Implemented support for encrypted documents when using PdfFileSource class.
  • Cloning SignatureField without Signature causes NullReferenceException.
  • InvalidCastException is thrown when parsing dictionary end without having dictionary start.
  • ArgumentNullException is thrown when exporting document that uses OpenType Font.
  • Exception is thrown when importing document with LZWDecode and Indexed Colorspace.
  • Wrong colors when importing documents with Indexed color space.
  • NotImplementedException occurs when importing pattern which uses unsupported colorspace.


  • Performance increased when comparing instances of HierarchicalIndex.
  • Introduced format painter functionality which allows copying format from one part of the text to another.
  • Performance problem when undoing deletion of text with many hyperlinks.
  • Find/Replace does not work properly when replacing word with digits.
  • The caret is drawn over letters in some cases.
  • Exception during layout of a document with floating image as first element on the second page.
  • Replacing string with the same string but in upper case leads to infinite loop.
  • KeyNotFoundException is thrown when exporting fragments to RTF or DOCX due to incorrectly preserved Next style property for elements other than Paragraph.
  • InvalidCastException is thrown when undoing character-properties editing commands applied on content wrapped in annotation ranges.
  • Importing documents with negative TabStop positions causes ArgumentOutOfRangeException.
  • Poor delete/undo delete performance with large number of AnnotationRanges.
  • Table with width set to 0 is imported with 0 width from HTML.
  • NullReferenceException is thrown when continuously working with a hyperlink.
  • Missing Spanish and French translations for the "Text Wrapping" string in FloatingBlockPropertiesDialog.


  • Implemented Today Button in the NavigationHeader.


  • Implemented automatic scaling options when printing and exporting to PDF.
  • KeyNotFoundException is thrown due to missing built in number formats with id 5, 6, 7, 8.
  • WorksheetPageSetup default paper type is now Letter.


  • Implemented automatic scaling options when printing and exporting to PDF.
  • Instantiating the control in two different threads throws InvalidOperationException.
  • WorksheetPageSetup default paper type is now Letter.


  • When a control is disabled while its tooltip is shown, all tooltips in the application stop showing.


  • Poor performance when selecting all items with Extended SelectionMode.
  • Cells from the first left frozen column overlap with those from the next column when column virtualization is switched off.
  • Degraded performance when loading new items and source collection is INotifyCollectionChanged

UI for Silverlight


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