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 R3 2018 SP1

October 17, 2018

All Controls

  • Updated templates of CheckBox and RadioButton in Windows8Touch theme and their pressed states to remove wrong and obsolete margins.


  • Setting the MinDropDownWidth property of AutoCompleteBox is not respected in Office2013, Office2016, Material and Fluent themes.


  • Marker is clipped when near the end of the scale in Vertical / Horizontal linear gauge.


  • Value types with the same numeric value and a different type are not properly resolved by the distinct value filter.
  • FontSize property was not applied to the GridViewFooterCell in Windows 8 theme and newer.
  • Setting the DisplayIndex of a column when the refresh is deferred results in an InvalidOperationException.
  • Excessive CPU usage when GroupRenderMode is set to Flat RowDetailsTemplate is used and RowDetailsVisibilityMode is set to True.
  • ArgumentOutOfRangeException is thrown when performing a CollectionChange with Replace action on the underlying collection and there's an applied FilterDescriptor.
  • Keyboard navigation does not work as expected when there are frozen columns on the right.
  • When the ClipboardPasteMode is InsertNewRows and a paste is performed, the newly added cells are added to the SelectedCells collection, which results in incorrect data in the clipboard when the SelectionUnit is FullRow and the SelectionMode is Single.
  • ArgumentException is raised when executing the SearchByText Command and ShowSearchPanel is False.
  • Search text is lost when switching themes.


  • Expose the IHeatMapSource interface and few methods of the HeatMapDefinition class in order to allow creating a custom heatmap source and definition.


  • Single 'f' mask token results in doubled 'ff' format when editing the value.
  • Milliseconds sections 'f' or 'ff' are not parsed correctly in DateTimeInput while editing.
  • Wrong value in CurrencyInput when typing more than 3 digits in Culture whose CurrencyDecimalSeparator/NumberDecimalSeparator and CurrencyGroupSeparator/NumberGroupSeparator have different values.
  • Editing fails to produce Value and Text is wrong in CurrencyInput with Culture whose currency symbol contains the group separator symbol.

PDF Viewer

  • Missing text because of handled NullReferenceException when simple encoding is initialized with NULL name.


  • Implement import and export for "W*" clipping operator.
  • Implemented import for "b" geometry operator.
  • InvalidCastException is thrown while importing font descriptor used by different types of fonts.
  • NullReferenceException is thrown when importing document with XFA fields.
  • Invoking ToString() of a PdfHexString containing empty string leads to IndexOutOfRangeException.


  • PropertyGroupDescription does not localize the dates using the LocalDataSourceProvider Culture.


  • FlagEnumEditor does not update its UI after setting the bound value to be the default enum value.


  • RadRichTextBox.Foreground property is used as style property for the document when DocumentInheritsDefaultStyleSettings is set to true.
  • Underline style cannot be changed from Font Properties dialog when another underline style is already applied.
  • Borders and shadows are missing around the control in Fluent and Material themes
  • ArgumentException is thrown when importing RTF documents in multiple threads.
  • Setting underline decoration using instances of the public classes instead the properties of the static UnderlineTypes leads to NullReferenceException when exporting the document to XAML.
  • ContextMenu icons are not updated when theme is changed


  • ArgumentException is thrown when exporting characters not supported in XML.


  • An InvalidOperationException is thrown while the bound collection is filtered and the tree lines are visible.


  • Removed gap between CheckBox/RadioButton elements by collapsing Image in TreeView if there is no source for it.

UI for Silverlight


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