Add support for digital signature in the XLSX format.

Add sheet list that allows activating a sheet similar to Excel.

Number format not working when the decimal separator is set to comma.

Vertical and horizontal scroll bar moves too fast once outside of the Viewport and one is dragging the selection.

 RadSpreadsheetSheetSelector add options for disabling the reordering and the editing of the sheets 

Implement auto complete for ListDataValidationRule like in Excel.

Provide a way so one can change the default cell editor with a custom one.

Data validation dialog buttons should respond to the Enter or Esc keys (Retry, Cancel).

Copy/Paste a shape and then an image leads to a wrong result. 

Steps to reproduce: 

1. Copy plain text from a plain text editor onto the clipboard -> Paste in Spreadsheet and the text is pasted OK.
2. Copy the image from another app onto the clipboard -> Paste in Spreadsheet and the "This information cannot be pasted" dialog is displayed.
3. Insert picture from file into spreadsheet -> image displayed in a shape.
4. Select and copy the shape.
5. Repeat step 1 => Copy plain text from a plain text editor onto the clipboard -> Paste in Spreadsheet and the text is pasted OK.
6. Repeat step 2 => Copy image from another app onto clipboard -> Paste in Spreadsheet and shape selected and copied in step 4 is pasted. => Not expected result.

Memory leak when opening a new window that contains a spreadsheet several times.

We have a problem creating an Excel file with Telerik.Windows.Documents.Spreadsheet. 
In our last release for our customers we used Telerik WPF version 22.2.613.40 (Spreadsheet DLL)

When calling the following line of code

m_Worksheet.Cells[m_CurrentRowIndex, m_CurrentColumnIndex].SetValue("111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 111111111111111111111111111111111111111111111111111111111111111111111 111111111111111111111111111111111111111111111111111111111111111111111 111111111111111111111111111111111111111111111111111111111111111111111 111111111111111111111111111111111111111111111111111111111111111111111 111111111111111111111111111111111111");

the CellValueType is set to text and the Value is correct.

We have now switched our project to .NET 7 and Telerik WPF to version 2023.2.519.70.

We discovered that this line of code no longer works.

The CellValueType is now Number and the Value Infinity

Have you changed anything internally? How can we solve the problem now?

Slow performance with documents that contain many custom styles. 

Implement pasting of images similar to Excel. 

Investigate if the performance with large files can be improved. Currently a document with a million ros is opened slowly and the memory consumption is high. 

In Excel, when you copy a range and then paste it into a larger one, the values are repeated to fill the larger range. This can be included in RadSpreadsheet as well.

Searching with Ctrl-F in a sheet with many rows takes a long time.

The sheet navigation does not work with specific theme and document.

Currently, Custom IconSets are not supported when having Conditional Formatting scenarios.

The cursor position is changed when one clicks in the middle of a formula. The cursor is moved to the end of the text. 

One cannot reference another sheet in a formula by using the UI