Completed
Last Updated: 13 Aug 2026 09:40 by ADMIN
Release Telerik UI for WPF 2026.3.812 (Q3 2026)
Currently, when the user is editing a cell and saves the document without leaving the edit mode first, the current value is not preserved in the saved document.
When pressing the File -> Save button in the ribbon, the Save dialog doesn't appear at all.
 
Workaround: Manually commit the change before saving. This workaround will also respect data validation:
var layer = ((NormalWorksheetEditorPresenter)radSpreadsheet.ActiveWorksheetEditor.ActivePresenter).UILayers.GetByName(WorksheetPredefinedUILayers.CellInput);
CellInputUILayer cellInputUILayer = (CellInputUILayer)layer;
cellInputUILayer.ApplyChange();
Completed
Last Updated: 13 Aug 2026 09:40 by ADMIN
Release Telerik UI for WPF 2026.3.812 (Q3 2026)
Value of a cell is visualized outside of the cell boundaries, or the value is clipped and partially visible, when the cell is updated (from code-behind), while being in an inactive worksheet, and is referenced by another cell from the active sheet.

Workaround: get a value of some cell in the active sheet and set it again to the same cell.

The issue is reproducible after the official release of Q1 2015.
Completed
Last Updated: 13 Aug 2026 09:40 by ADMIN
Release Telerik UI for WPF 2026.3.812 (Q3 2026)
When RadSpreadsheet is placed inside a data template and the Workbook property is bound, the binding fails. 

In the Convert() method of the debug converter, the proper value is set. However, an empty workbook is displayed in the view.
Completed
Last Updated: 13 Aug 2026 09:40 by ADMIN
Release Telerik UI for WPF 2026.3.812 (Q3 2026)

For the German language translations, the following resource keys are translated into Dutch instead:

  • Spreadsheet_PrintPreview_FitSheetOnOnePage
  • Spreadsheet_PrintPreview_FitSheetOnOnePage_Description
  • Spreadsheet_PrintPreview_FitColumnsOnOnePage
  • Spreadsheet_PrintPreview_FitColumnsOnOnePage_Description
  • Spreadsheet_PrintPreview_FitRowsOnOnePage
  • Spreadsheet_PrintPreview_FitRowsOnOnePage_Description
Completed
Last Updated: 13 Aug 2026 09:39 by ADMIN
Release 2026.2.624 (2026 Q2)
Workaround: Import the document without using the default command

OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "All Spreadsheet Files (*.txt, *.csv, *.pdf, *.xlsx)|*.txt;*.csv;*.pdf;*.xlsx|Excel Workbook (*.xlsx)|*.xlsx|CSV (Comma delimited) (*.csv)|*.csv|Text (Tab delimited) (*.txt)|*.txt|All Files (*.*)|*.*";
if (openFileDialog.ShowDialog() == true)
{
    string extension = Path.GetExtension(openFileDialog.SafeFileName);
    using (Stream input = openFileDialog.OpenFile())
    {
        Workbook workbook = WorkbookFormatProvidersManager.Import(extension, input);
        workbook.Name = openFileDialog.SafeFileName; // in the default implementation this is set after applying the document to RadSpreadsheet and triggers the event
       
        this.radSpreadsheet.Workbook = workbook;
    }
}
Declined
Last Updated: 10 Aug 2026 14:23 by ADMIN
The style name "+-" is a valid one, but the StyleGallery crashes because it tries to set the name as a value of a cell and it is not a valid cell value.
Declined
Last Updated: 10 Aug 2026 13:20 by ADMIN
Borders can overhang 1 px from the corresponding cells. The issue is reproducible only on some zoom levels, and is most probably related to WPF layout rounding. The issue is mostly visible when borders are missing. 

On different zoom levels, different borders are hanging.
Declined
Last Updated: 31 Jul 2026 08:20 by ADMIN
If the RadSpreadsheet is declared as a child content in the RadBusyIndicator, there isn't any tab selected as active in the SheetSelector.

Workaround: Declare the busy indicator after the RadSpreadsheet not as its child.

For example, instead of:

<telerik:RadBusyIndicator>
    <telerik:RadSpreadsheet x:Name="radSpreadsheet" />
</telerik:RadBusyIndicator>

Do:

<Grid>
    <telerik:RadSpreadsheet x:Name="radSpreadsheet" />
    <telerik:RadBusyIndicator />
</Grid>
In Development
Last Updated: 29 Jun 2026 06:23 by ADMIN

RadSpreadsheetFormulaBar has a drop down list that shows the named ranges in the document. If a named range contains an underscore character (ex: Income_Amount), the associated item in the drop down won't display the underscore (ex: IncomeAmount).

To workaround this, you can use a global Loaded event handler of RadMenuItem and override the Header content with a TextBlock.

static MainWindow()
{
    EventManager.RegisterClassHandler(typeof(RadMenuItem), RadMenuItem.LoadedEvent, new RoutedEventHandler(OnMenuItemLoaded));
}

private static void OnMenuItemLoaded(object sender, RoutedEventArgs e)
{
    var menuItem = (RadMenuItem)sender;
    if (menuItem.DataContext is DefinedName context)
    {
        menuItem.Header = new TextBlock() { Text = context.Name };
    }
}

Declined
Last Updated: 24 Jun 2026 11:29 by ADMIN
ADMIN
Created by: Boby
Comments: 0
Category: Spreadsheet
Type: Bug Report
0
The AM/PM value is not shown in the cell when formatting a time value.

Steps to reproduce:
1. Insert some time in a cell in spreadsheet (22:20)
2. Apply it a custom format that contains AM/PM (e.g. "h:mm AM/PM")

Observed: The AM/PM format is missing
Expected: AM or PM should be shown after the time (image attached) 

Declined: The changes could be applied if the user presses OK button instead of pressing Enter key. A new feedback item is open where the issue is described: https://feedback.telerik.com/Project/143/Feedback/Details/212042-spreadsheet-custom-number-type-values-in-format-cells-dialog-are-not-applied-wh
Completed
Last Updated: 02 Jun 2026 09:39 by ADMIN
Steps to reproduce: 

1. Enter in a cell =Today()
2. Show Format Cells dialog and set Custom format "d"

Expected: The value is the day of the month.
Actual: The date is formatted as short date but has to be day of the month.
Completed
Last Updated: 20 May 2026 11:37 by ADMIN
Release 2026.2.520 (2026 Q2)

The label of the field that allows you to set the ScreenTip in the Hyperlink dialog is not vertically centered to the associated textbox visual. This reproduces in the Windows11 theme.

To work this around, get the TextBlock element in the Hyperlink dialog and set its VerticalAlignment property to Center.

private void RadSpreadsheet_Loaded(object sender, RoutedEventArgs e)
{
    var hyperlinkDialog = this.spreadsheet.ActiveWorksheetEditor.Dialogs.HyperlinkDialog as HyperlinkDialogContent;
    hyperlinkDialog.Loaded += HyperlinkDialog_Loaded;
}

private void HyperlinkDialog_Loaded(object sender, RoutedEventArgs e)
{
    var dialog = (HyperlinkDialogContent)sender;
    var screenTipLocalizedText = LocalizationManager.Manager.GetStringOverride("Spreadsheet_InsertHyperlinkDialog_ScreenTip");
    var screenTipTb = dialog.ChildrenOfType<TextBlock>().FirstOrDefault(x => x.Text == screenTipLocalizedText);
    if (screenTipTb != null)
    {
        screenTipTb.VerticalAlignment = VerticalAlignment.Center;
    }            
}

Completed
Last Updated: 20 May 2026 11:37 by ADMIN
Release 2026.2.520 (2026 Q2)
Currently, the headers of the menu items in the context menu are hardcoded. Add localization support so they change based on the applied culture.
Completed
Last Updated: 14 May 2026 16:33 by ADMIN
Release 2026.2.514 (2026 Q2)
#.##0,00;-#.##0,00;;@ does not work in RadSpreadsheet. It should suppress visualizing of ) values.

Workaround: #.##0,00;-#.##0,00; ;@ works fine (there is ' ' [space] set for the zero values).
Completed
Last Updated: 14 May 2026 16:33 by ADMIN
Release 2026.2.514 (2026 Q2)
When setting the following strings as cell value, they are recognized as dates. In industry standard applications like MS Excel and OpenOffice, they are recognized as strings:
- "12 3456" in bg-BG, fr-FR, ru-RU, sv-FI, en-US
- "12.3456" in de-DE
- "1 23" in en-US
- "2013/5" in en-US
- "3000-03" in en-US
Completed
Last Updated: 14 May 2026 16:33 by ADMIN
Release 2026.2.514 (2026 Q2)
Steps to reproduce:
- Open RadSpreadsheet
 -Put 1 in B2 and B6
 -Put 0 in B3, B4, B5
 -Add filtering on columns A and B
 -Filter on column B to have only rows with 1. The rows 3 to 5 will be hidden.
 -Paste "1234" as cell selection in the Range A2:A6 
 Note: It is important to enter 1234 in another cell, make a cell selection and then paste it
 -Remove the filter

Expected: "1234" in pasted in cells A2 and A6 only.
Actual: "1234" in pasted in cells A2, A3, A4, A5, A6.
Completed
Last Updated: 21 Apr 2026 10:40 by ADMIN
Release Telerik UI for WPF 2026.1.415
Selecting a column with two or more merged cells, selects not only the selected column but the rest of columns that the merged cells are from. The behavior when working with rows is analogical.
Completed
Last Updated: 15 Apr 2026 07:43 by ADMIN
Release Telerik UI for WPF 2026.1.415
Currently, if you have a cell that merges into multiple columns, when you click on the column header, this will select also the adjacent columns where the merged cell extends. Add an option to disable this functionality and select only the cells in the clicked column.
Duplicated
Last Updated: 06 Mar 2026 14:17 by ADMIN

Hi Team,

   I have backported the Xlsx file to Xls format. When I am trying to import the backported file using the Radspreadsheet UI control, I find that it has lost the color formatting which was existing in the original Xlsx file. Where as when we open the back ported file with Excel application we find that all the data and formatting is maintained.

So the request is that after backporting  and while importing the file, it should not loose the minimal xls supported features which Excel is able to support.





Attached is the InitialFile.xlsx and BackPorted.xls file

Note that Xlsx file if imported it maintains the data and formatting information of the workbbok when loaded via UI control.
Let us know in case of any more details or queries.

Exepct this to work

Regards,

Manish.

Unplanned
Last Updated: 06 Mar 2026 13:57 by Manish

We have a document in XLS format produced by GemBox. The yellow cells get black once the document is imported and then exported (back to XLS or XLSX) with RadSpreadProcessing.

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