Spreadsheet: Add the ability to build formulas using keyboard navigation:

1. Press '=' in a cell. The cell goes into Edit Mode. 
2. Use the Keyboard arrow keys to move in any direction. The Cell reference of the focused cell is automatically entered after the '=' into the cell which is in edit mode.
3. The user can press the Control+Arrow Key to add a reference to an entire row or column of data.

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.

The sheet selector should hide sheets when their visibility is set to hidden or very hidden. The context menu of the sheet selector should contain Hide and Unhide options that allow to hide a sheet or unhide one of the hidden sheets.

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. 

The data validation error message box has an invalid size when shown multiple times

DataValidation of a list with defined names is not taking the source into account. As a result, values are not displayed as options in the cell drop-down list.

Defined names do not appear in the Name Box.

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. 

A filter cannot be applied to the RadSpreadsheet when a sheet is protected even though the Filter option in the protection dialog is checked.