Telerik UI for Winforms

Release History

UI for WinForms R2 2023 SP1 (version 2023.2.718)

July 19, 2023

What's new

  • RadHeatMap: Introduce legend functionality.

Demo Application

  • The Virtual Keyboard Settings example crashes on HDPI.

Installation and general issues

  • Downloaded NetCore source code projects from Telerik Your Account can't be built.
  • .NET Framework Design project cannot be built from the downloaded source code.


  • Updated PdfProcessing examples.


  • Property builder in design time, reset visual settings applied to the series.


  • Copying and pasting controls using the designer context menu results in an error if the form contains a RadBindingNavigator/RadCommandBar control.


  • Add functionality for clear loading of XML layout.
  • Expose RemoveAllToolWindows method.


  • Clear filter buttons are visible when no filter is applied in some themes.


  • GridPrintStyle.HierarchyIndent is lost after Print Settings and hitting the button Preview.
  • Dropping a column from the ColumnChooser on the data row should not be possible.
  • An error message appears, while typing in a textbox editor of the composite filter dialog, and enter key is pressed.
  • Deleting text in the search row may lead to a null exception.
  • Should not paint the bottom drag hint while reordering the columns.


  • Missing text when importing font with not fully defined FontDescriptor.
  • Some encrypted PDF files are not Decrypted correctly in RadPdfViewer.
  • NotImplementedException when loading a document.
  • Missing text when importing Standard Font with not fully defined FontDescriptor.
  • ExternalException: A generic error occurred in GDI+ when using GetHicon.
  • Wrong calculation in the text positioning when the first symbol in the text string array is empty.
  • The stroke thickness of the thinnest line is thinner than in Adobe.
  • Encrypt property is ignored on import when there is CrossReferenceStream.


  • New validation API while importing XAML inside the XamlFormatProvider.
  • NullReferenceException when changing themes, the RichTextBox has TrackChanges enabled, and the current user is set.


  • Visual Style Builder: Update default theme to VisualStudio2022Dark.


  • Export the optional Signature`s Filter property when exporting to a PDF file.
  • Wrong rendering of glyphs with a specific CFF font.
  • An InvalidCastException is thrown when a name start character (\) is followed by a literal string start character (().
  • An Invalid position when the TJ operator array contains empty values.
  • An IndexOutOfRangeException executing CalculateMultidimensionalLinearInterpolationResult method of SampledFunction class.
  • An Unhandled ArgumentNullException is thrown when importing a document with no pages.
  • An unhandled ArgumentException is thrown when importing a document containing CIDFont with negative glyph widths.
  • Text is missing when FontDescriptor is not fully defined.
  • Text is displayed with bigger glyphs for some CidFontType0 fonts with CFF font source.
  • Some Chinese characters cannot be found in s a specific cmap.
  • Slow import of documents containing large images with SMask.
  • Saving a document with a linearized document structure produces a document that fails to load in some viewers.
  • Redact annotations are not displayed correctly when the page is rotated.
  • RadPdfViewer crashes when an exception is thrown asynchronously.
  • PdfViewer's GoToPage method is not working on initial load of PdfViewer when called in DocumentChanged event handler.
  • Missing text content caused by handled ArgumenNullException while parsing Type1 font file.
  • Missing Text Characters when Viewing PDF Document.
  • Missing content because handled IndexOutOfRangeException is thrown while decoding stream with RunLengthDecode filter.
  • Missing Annotations when opening a document containing GoTo action with Named Destination.
  • Lines with small length and big thickness are rendered as big squares.
  • KeyNotFoundException is thrown when a destination is missing from the catalog.
  • A KeyNotFoundException is thrown when importing a document with destinations pointing to invalid page references.
  • Images compressed with CCITTFaxDecode with BlackIs1 parameter are rendered with inverted black and white colors.
  • Glyph geometries are rendered disordered when Courier and Custom Open-Sands Type1 fonts are used.
  • Form Fields are not clickable when they appear inside an unsupported annotation.
  • Destinations with null properties don't scroll to the page.
  • Content with Type1 font with MacRomanEncoding is not visualized.
  • CffFontSource does not render apostrophe characters correctly from the FreeSerif font file.
  • Annotations are misplaced when the Page boundaries have offset different than 0.
  • The Helvetica-UltraCompressed font is not parsed correctly and is changed to Helvetica.
  • An InvalidCastException is thrown when importing a document and the endstream is not on a new row.
  • Signature widgets are not imported correctly when the file is signed with safari.
  • Radio buttons and Check boxes are imported deselected when their field does not specify the field value.
  • PdfStreamWriter: Page content is corrupted when merging pages whose content has Predictor 1 set as DecodeParms.
  • The Path is imported with incorrect clipping and color.
  • NullReferenceException is thrown when the appearance of widget annotation is missing.
  • InvalidCastException when importing link annotations that are referenced with indirect reference.
  • Incorrect calculation of line spacing when LineSpacingType is set to Exact or AtLeast and the paragraph split between pages.
  • Generating a document containing Chinese symbols hangs in some specific scenarios.
  • Exporting encrypted RadFixedDocument with Interactive Forms leads to an invalid widget caption and name.
  • Exporting a field with missing Appearances property causes an exception.
  • Bookmark titles are not visible when declared as indirect objects.
  • An ArgumentOutOfRangeException is thrown when importing a Fit Horizontal destination with a missing top value.
  • An ArgumentException is thrown sporadically when exporting a protected document containing a form field.


  • Introduced support for Charts in NET Standard.
  • The NotBetween conditional formatting rule applies the format to all the cells, no matter if the rule is satisfied or not.
  • NullReferenceException is thrown when creating a combo chart with two chart types and three data columns for a series.
  • Exception Invalid data passed is thrown when exporting with DataTableProvider and a column contains text and numbers.
  • DataValidation is corrupted on import and export when the rule uses a formula with string arguments.


  • NullReferenceException when exporting bookmarks spanning more than one paragraph.
  • ArgumentOutOfRangeException when inserting a table right after an empty paragraph using the editor.
  • When a value contains points (w:pos=85.50pt) can't be properly converted.
  • The font fallback mechanism does not find the correct font to display unsupported special characters which results in wrong character rendering or in missing characters.
  • Paragraph properties are not imported from HTML when the paragraph is inside a list item.
  • WordsProcessing: Line breaks in text content are not imported as space from HTML.
  • FormatException when importing a document with start or end values for borders.

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