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Unplanned
Last Updated: 17 Sep 2025 14:55 by Martin Ivanov
RichTextBox: Add support for export/import of the FloatingImageBlock TextWrapping setting to HTML
Created by: Martin Ivanov
Comments: 0
Category: RichTextBox
Type: Feature Request
1
RichTextBox: Add support for export/import of the FloatingImageBlock TextWrapping setting to HTML
Add support for export and import of the TextWrapping setting of the FloatingImageBlock to HTML. 
Unplanned
Last Updated: 17 Sep 2025 11:48 by Marco
ScheduleView: Add support for displaying the full length of an appointment when it spreads across multiple days
Created by: Stenly
Comments: 1
Category: ScheduleView
Type: Feature Request
3
ScheduleView: Add support for displaying the full length of an appointment when it spreads across multiple days
Add support for displaying the full length of an appointment when its length is spread across multiple days.
Unplanned
Last Updated: 17 Sep 2025 08:47 by Martin Ivanov
ChartView: TypeAccessException thrown in .NET Framework when using internal class for the data point models
Created by: Martin Ivanov
Comments: 0
Category: ChartView
Type: Bug Report
2
ChartView: TypeAccessException thrown in .NET Framework when using internal class for the data point models

TypeAccessException occurs in .NET Framework projects when using internal class for the data point models. The error doesn't occur in .NET 8 projects.

dsa

System.TypeAccessException: 'Attempt by method 'DynamicClass.Telerik_DynamicGetter_Argument(System.Object)' to access type 'WpfApp29.ChartPoint' failed.'
at Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.PropertyNameDataPointBinding.GetValue(object instance) 	Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ScatterSeriesDataSource.InitializeBinding(Telerik.Windows.Controls.ChartView.DataPointBindingEntry binding)	Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ChartSeriesDataSource.GenerateDataPoint(object dataItem, int index) 	Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ChartSeriesDataSource.BindCore(System.Collections.IEnumerable source)
Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ChartSeriesDataSource.Bind(System.Collections.IEnumerable itemSource)
Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ChartSeriesDataSource.Rebind(System.Collections.IEnumerable oldSource, System.Collections.IEnumerable newSource, bool shouldUpdateSelectedPoints) Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ChartSeriesDataSource.ItemsSource.set(System.Collections.IEnumerable value)
Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ChartSeries.InitDataBinding() Line Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ScatterPointSeries.InitDataBinding() 
Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.ChartSeries.OnApplyTemplate() Telerik.Windows.Controls.Chart.dll!Telerik.Windows.Controls.ChartView.PointTemplateSeries.OnApplyTemplate()

To work this around, upgrade the target framework of the project to .NET 8. Or use the GenericDataPointBinding class for the binding properties of the series (XValueBinding, YValueBinding, etc.), instead of the default PropertyNameDataPointBinding.


Unplanned
Last Updated: 15 Sep 2025 10:01 by Martin Ivanov
DataForm: Selection of an editable RadComboBox hosted in the EditTemplate gets cleared on commit edit
Created by: Martin Ivanov
Comments: 0
Category: DataForm
Type: Bug Report
0
DataForm: Selection of an editable RadComboBox hosted in the EditTemplate gets cleared on commit edit

The selection a RadComboBox hosted in RadDataForm gets cleared on commit changes. This happens when the RadComboBox is added in the EditTemplate and its IsEditable is set to True. Committing the edit clears the TextBox of the ComboBox, which clears the selection.

To work this around, subscribe to the EditEnding event of RadDataForm and clear the DataContext of the RadComboBox element.

  private void RadDataForm_EditEnding(object sender, Telerik.Windows.Controls.Data.DataForm.EditEndingEventArgs e)
  {
      var dataForm = (RadDataForm)sender;
      var myField = dataForm.ChildrenOfType<DataFormDataField>().FirstOrDefault(df => df.Name == "myField");
      if (myField != null)
      {
          var comboBox = (RadComboBox)myField.Content;
          comboBox.DataContext = null;
      }
  }

Unplanned
Last Updated: 11 Sep 2025 19:32 by Martin Ivanov
Spreadsheet: Multiple filter visual icons appear in merged cells - one for each column in the range of the merged cells
Created by: Martin Ivanov
Comments: 0
Category: Spreadsheet
Type: Bug Report
0
Spreadsheet: Multiple filter visual icons appear in merged cells - one for each column in the range of the merged cells

When filter is added to merged cells, there should be a single filter icon displayed in the combined cell. Instead, multiple filters appear - one for each column in the range of the merged cells.

Unplanned
Last Updated: 02 Sep 2025 12:21 by Philipp
RibbonView: Add support to show the system menu on the RadRibbonWindow element when IsWindowsThemeEnabled=False and the Shift + right mouse button is clicked on the icon on the taskbar
Created by: Stenly
Comments: 1
Category: RibbonView
Type: Feature Request
2
RibbonView: Add support to show the system menu on the RadRibbonWindow element when IsWindowsThemeEnabled=False and the Shift + right mouse button is clicked on the icon on the taskbar
Add support to show the system menu on the RadRibbonWindow element when IsWindowsThemeEnabled=False and the Shift + right mouse button is clicked on the icon on the taskbar.
Unplanned
Last Updated: 01 Sep 2025 11:35 by Martin Ivanov
RichTextBox: Exceptions occur on loading documents with element tags that don't have direct content but are using opening and closing tags instead of self-closing tags
Created by: Martin Ivanov
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: Exceptions occur on loading documents with element tags that don't have direct content but are using opening and closing tags instead of self-closing tags

The RichTextBox internal logic that imports .docx documents (DocxFormatProvider) doesn't support elements that don't need direct content, but have both start and end tags. Instead such elements should use self-closing tags. 

For example, instead of <w:vertAlign w:val="baseline"></w:vertAlign> it should be <w:vertAlign w:val="baseline"/>

When such element is read during import, issues may occur. Two main known issues here are with the w:vertAlign and Relationship tags.

Using

<w:vertAlign w:val="baseline"></w:vertAlign>

instead of

<w:vertAlign w:val="baseline"/>

throws NullReferenceException with the following stack trace:

System.NullReferenceException: 'Object reference not set to an instance of an object.'
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.OpenXmlHelper.ConvertStringToBaselineAlignment(string value) Line 168 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.SpanStyleImporter.ReadBaselineAlignment(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 243 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.SpanStyleImporter.ReadStyle(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 88 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.ReadSpanStyleProperties(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 278 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.ReadStyle() Line 188 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.Import() Line 67 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase importer) Line 430 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentAndRelationsFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase importer) Line 406 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.Import() Line 190 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider.Import(System.IO.Stream input) Line 147 C#
Telerik.Windows.Documents.dll!Telerik.Windows.Documents.FormatProviders.DocumentFormatProviderBase.Import(byte[] input) Line 90 C#

Using

<Relationship Id="rId00004" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"></Relationship>

instead of

<Relationship Id="rId00004" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"/>

throws KeyNotFoundException with the following stack trace:

KeyNotFoundException: The given key was not present in the dictionary.
    System.ThrowHelper.ThrowKeyNotFoundException() in ThrowHelper.cs
    System.Collections.Generic.Dictionary<TKey, TValue>.this[TKey].get(TKey) in Dictionary.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.PartRelationsImporter.GetRelationByID(string) in PartRelationsImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.GetRelationByID(string) in DocxImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildSection() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildBody() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildDocument() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.Import() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase) in DocxImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentAndRelationsFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase) in DocxImporter.cs

To work this around, import the document with the WordsProcessing library. If you need to display it in RadRichTextBox, you can export it again using the WordsProcessing library. This will normalize the tags. Then import it again using the RadDocument's DocxFormatProvider.

 var dplDocxFormatProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider();
 RadFlowDocument flowDocument = dplDocxFormatProvider.Import(File.ReadAllBytes("../../../test.docx"), null);

 var docBytes = dplDocxFormatProvider.Export(flowDocument, null);
 File.WriteAllBytes("../../../modified-doc.docx", docBytes);

 var rtbDocxFormatProvider= new Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider();
 RadDocument document = rtbDocxFormatProvider.Import(File.ReadAllBytes("../../../modified-doc.docx"));

 

Unplanned
Last Updated: 28 Aug 2025 09:28 by Dimitar
Telerik Licensing: Telerik Trail Licence Warning when using class library
Created by: Dimitar
Comments: 0
Category: UI for WPF
Type: Bug Report
0
Telerik Licensing: Telerik Trail Licence Warning when using class library
Telerik Trail Licence Warning when using class library
Unplanned
Last Updated: 27 Aug 2025 05:41 by Lorenzo
PropertyGrid: Introduce support for add/remove instances of child/nested objects
Created by: Lorenzo
Comments: 0
Category: PropertyGrid
Type: Feature Request
1
PropertyGrid: Introduce support for add/remove instances of child/nested objects
Introduce support for add/remove instances of child/nested objects.
Unplanned
Last Updated: 26 Aug 2025 14:24 by Martin Ivanov
PropertyGrid: Pressing Enter key when a field editor is focused scrolls to the top if the vertical scrollbar is displayed and the properties are grouped
Created by: Martin Ivanov
Comments: 0
Category: PropertyGrid
Type: Bug Report
1
PropertyGrid: Pressing Enter key when a field editor is focused scrolls to the top if the vertical scrollbar is displayed and the properties are grouped

Pressing the Enter key when a field editor is focused will scroll the vertical scrollbar to the topmost offset. This is reproducible when the properties are grouped. Also, the RenderMode should be set to Flat.

To work this around, change the RenderMode setting to Hierarchical right before the Enter key logic is executed and then return it back to Flat after some time.

private void RadPropertyGrid_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
    var propertyGrid = (RadPropertyGrid)sender;
    var currentMode = propertyGrid1.RenderMode;
    propertyGrid.RenderMode = RenderMode.Hierarchical;

    Dispatcher.BeginInvoke(new Action(() =>
    {
        propertyGrid.RenderMode = currentMode;
    }));
}

Unplanned
Last Updated: 22 Aug 2025 06:17 by Jonas
Spreadsheet: Handle the case when the cell is too small and the value contains decimal separator
Created by: Jonas
Comments: 0
Category: Spreadsheet
Type: Feature Request
1
Spreadsheet: Handle the case when the cell is too small and the value contains decimal separator

Handle the case when the cell is too small and the value contains a decimal separator. 

For example, see attached images. 

Unplanned
Last Updated: 22 Aug 2025 06:07 by ADMIN
RichTextBox: HtmlformatProvider: Nested tables with empty cells are not correctly imported.
Created by: Naval
Comments: 10
Category: RichTextBox
Type: Bug Report
0
RichTextBox: HtmlformatProvider: Nested tables with empty cells are not correctly imported.
Nested tables with empty cells are not correctly imported. 
Unplanned
Last Updated: 20 Aug 2025 15:21 by Stenly
Spreadsheet: Deselecting the current active cell, which is part of a selection range, does not clear its selection
Created by: Stenly
Comments: 0
Category: Spreadsheet
Type: Bug Report
0
Spreadsheet: Deselecting the current active cell, which is part of a selection range, does not clear its selection
When selecting multiple cells, clicking on the current active cell (which is selected) does not clear its selection but moves the active cell to one of the other cells from the selected range.
Unplanned
Last Updated: 15 Aug 2025 14:49 by Stenly
ListBox: Memory leak is present when removing items from the ItemsSource
Created by: Stenly
Comments: 0
Category: ListBox
Type: Bug Report
1
ListBox: Memory leak is present when removing items from the ItemsSource
Memory leak is present when removing items from the ItemsSource collection.
Unplanned
Last Updated: 15 Aug 2025 13:39 by ADMIN
RichTextBox: Add option for custom tooltips for hyperlinks
Created by: Iva
Comments: 4
Category: RichTextBox
Type: Feature Request
6
RichTextBox: Add option for custom tooltips for hyperlinks 
Currently, the only customization that can be performed is using HyperlinkToolTipFormatString property of RadRichTextBox, which sets the format for all hyperlinks in the document of the control. It would be nice if it were possible to be able to set different tooltips.
Unplanned
Last Updated: 15 Aug 2025 05:42 by Swapnil
RichTextBox: Bold/Italic does not work for some font styles
Created by: Swapnil
Comments: 0
Category: RichTextBox
Type: Bug Report
0
RichTextBox: Bold/Italic does not work for some font styles

Bold/Italic does not work for some font styles.

This might be a framework limitation in WPF: https://www.telerik.com/forums/some-fonts-are-not-able-to-bold-italic

Sample fonts list:

  1. Tw Cen MT Condensed Extra Bold (bold/italic)
  2. Tw Cen MT Condensed (bold/italic)
  3. Sitka Text Semibold (italic)
  4. Sitka Subheading Semibold (italic)
  5. Sitka Small Semibold (italic)
  6. Sitka Heading Semibold (italic)
  7. Sitka Display Semibold (italic)
  8. Sitka Banner Semibold (italic)
  9. Segoe UI Variable Text Semibold (italic)
  10. Segoe UI Variable Text Light (bold/italic)
  11. Segoe UI Variable Display Light (bold/italic)
  12. Segoe UI Semilight (bold/italic)
  13. Segoe UI Semibold (bold/italic)
  14. Segoe UI Light (bold/italic)
  15. Segoe UI Black (italic)
  16. Script MT Bold (bold/italic)
  17. Rockwell Condensed (bold/italic)
  18. Rockwell Extra Bold (italic)
  19. Rage Italic (bold/italic)
  20. OCR A Extended (bold/italic)
  21. Nirmala UI Semilight (bold/italic)
  22. Microsoft YaHei UI Light (bold/italic)
  23. Microsoft YaHei Light (bold/italic)
  24. Microsoft JhengHei UI Light (bold/italic)
  25. Microsoft JhengHei Light (bold/italic)
  26. Malgun Gothic Semilight (bold/italic)
  27. Leelawadee UI Semilight (bold/italic)
  28. Gloucester MT Extra Condensed (bold/italic)
  29. Gill Sans Ultra Bold Condensed (bold/italic)
  30. Gill Sans Ultra Bold (bold/italic)
  31. Gill Sans MT Ext Condensed Bold (bold/italic)
  32. Gill Sans MT Condensed (bold/italic)
  33. Franklin Gothic Medium Cond (bold/italic)
  34. Franklin Gothic Heavy (bold/italic)
  35. Franklin Gothic Medium (bold/italic)
  36. Franklin Gothic Demi (bold/italic)
  37. Franklin Gothic Demi Cond (bold/italic)
  38. Franklin Gothic Book (bold/italic)
  39. Dubai Medium (bold/italic)
  40. Dubai Light (bold/italic)
  41. Corbel Light (bold/italic)
  42. Copperplate Gothic Light (bold/italic)
  43. Copperplate Gothic Bold (bold/italic)
  44. Cooper Black (bold/italic)
  45. Cascadia Mono SemiLight (bold/italic)
  46. Cascadia Mono SemiBold (italic)
  47. Cascadia Mono Light (bold/italic)
  48. Cascadia Code SemiLight (bold/italic)
  49. Cascadia Mono ExtraLight (bold/italic)
  50. Cascadia Code SemiBold (italic)
  51. Cascadia Code Light (bold/italic)
  52. Cascadia Code ExtraLight (bold/italic)
  53. Candara Light (bold/italic)
  54. Calibri Light (bold/italic)
  55. Britannic Bold (bold/italic)
  56. Bodoni MT Condensed (bold/italic)
  57. Bodoni MT Black (italic)
  58. Bernard MT Condensed (bold/italic)
  59. Bahnschrift SemiLight Condensed (bold/italic)
  60. Bahnschrift SemiLight SemiConde (bold/italic)
  61. Bahnschrift SemiLight (bold/italic)
  62. Bahnschrift SemiBold (bold/italic)
  63. Bahnschrift SemiBold SemiConden (bold/italic)
  64. Bahnschrift SemiCondensed (bold/italic)
  65. Bahnschrift SemiBold Condensed (bold/italic)
  66. Bahnschrift Light Condensed (bold/italic)
  67. Bahnschrift Light  (bold/italic)
  68. Bahnschrift Condensed (bold/italic)
  69. Arial Rounded MT Bold (bold/italic)
  70. Arial Narrow (bold/italic)
  71. Arial Black (italic)

 

Unplanned
Last Updated: 14 Aug 2025 13:35 by Stenly
RichTextBox: Importing an HTML that contains an image with align attribute does not apply the alignment
Created by: Stenly
Comments: 0
Category: RichTextBox
Type: Bug Report
1
RichTextBox: Importing an HTML that contains an image with align attribute does not apply the alignment
When importing an HTML string that contains an image, which has an align attribute, the image creation logic on import does not take this attribute's value and apply it.
Unplanned
Last Updated: 13 Aug 2025 10:18 by Stenly
GridView: ArgumentOutOfRangeException is raised when the culture is set to th-TH and the ItemsSource is rebound to a non-initialized collection
Created by: Stenly
Comments: 0
Category: GridView
Type: Bug Report
0
GridView: ArgumentOutOfRangeException is raised when the culture is set to th-TH and the ItemsSource is rebound to a non-initialized collection
When the culture is set to th-TH (Thai culture), an ArgumentOutOfRangeException is raised when the ItemsSource of RadGridView is rebound.
Unplanned
Last Updated: 12 Aug 2025 13:14 by Stenly
Spreadsheet: The page range in the print preview dialog is not correctly transferred to the native PrintDialog when the FromPage is higher than 1
Created by: Stenly
Comments: 0
Category: Spreadsheet
Type: Bug Report
0
Spreadsheet: The page range in the print preview dialog is not correctly transferred to the native PrintDialog when the FromPage is higher than 1
Using the print preview dialog to customize the printing, the page range is not correctly transferred when the FromPage is set to a value higher than 1.

For example, if the total page count is 11, setting the FromPage to 2 and ToPage to 8, the page range in the native PrintDialog will be set to 2-7. Setting the FromPage to 3 and the ToPage to 8 will result in the page range to be 3-6.
Unplanned
Last Updated: 12 Aug 2025 09:34 by Martin Ivanov
GridView: Memory leak in the ItemsSource collection when using INotifyCollectionChanged and switching user sessions on the computer or connecting to a remote desktop session
Created by: Martin Ivanov
Comments: 0
Category: GridView
Type: Bug Report
1
GridView: Memory leak in the ItemsSource collection when using INotifyCollectionChanged and switching user sessions on the computer or connecting to a remote desktop session

When using an INotifyCollectionChanged (like ObservableCollection<T>), RadGridView's data engine subscribes to the CollectionChanged event of the bound collection.

It seems that the WPF views are recreated when you connect to a running remote desktop session or switch the user to a session where the corresponding WPF app is already opened. This creates new instances of all controls, but no unload or another disposal event happens. In this case, the logic that subscribes to the CollectionChanged event again is triggered for the new RadGridView, but the old one never detaches from the event. This causes a memory leak.

If you connect to the session multiple times, the CollectionChanged handler will be attached multiple times leading to a memory leak.

To work this around, set the ItemsSource of RadGridView to null in the SystemEvents.SessionChanged static event.

private void SystemEvents_SessionSwitch(object sender, SessionSwitchEventArgs e)
{
    if (e.Reason == SessionSwitchReason.SessionLock)
    {
        BindingOperations.ClearAllBindings(this.RadGridViewFixed);
    }
}

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