Implement support for ChartSheet 

At this point, the ribbon and the context menu are not localized out of the box and the users need to change the strings manually.

Implement functionality to rotate the text in a cell.

Currently, caching formula results is not supported.

A sparkline is a tiny chart in a worksheet cell that provides a visual representation of data that is currently not supported.

Currently, there is an option to export the spreadsheet to PDF file and using RadPdfViewer`s WPF control ThumbnailFactory class to export the PDF document pages to images. Sample code may be seen at this public item: PdfProcessing: Export document pages to images.

Currently, the CellPropertyChanged event gives information only about which property is changed and in which cell range. But you can not get information about the exact change if it is set value, or clear. Also, the CommandExecuted event does not give you information about the executed command. Is if Set command? Clear command or something else.

Provide the ability to work with images in headers/footers of a worksheet. Note that large images put in headers are visualized as watermarks on printing/exporting to PDF.

Hi,

I think it would be really cool to include a search bar in the filter window, as implemented in Excel (Please find attached a screenshot for demonstration). This is a very useful functionality, as there may be too many options to choose from is the filter is added to subject ID, which could result in thousands IDs.

Currently, this can be achieved partially by using the FlowDirection property but the result could be unexpected for right-to-left. 

Right now this functionality is missing and the user is not able to scroll the viewer when the row header is selected and not the cell.

SUBSTITUTE  - replaces text in a given string by matching.
REPLACE - replaces characters specified by location in a given text string with another text string.

The PickCellRange dialog should allow using the formula selection to select cell ranges and convert them into text.

This feature allows automatically to group ordered data in the table and calculate the subtotals of the values column in each group of similar items. The subtotals are included just after each grouped items.

When Esc key is pressed charts dialog should close.

Add support for preserving and exporting the macros in a macro-enabled workbook.

Macros are pieces of code written in Visual Basic for Applications (VBA) which are used to automate repetitive tasks in excel. The macros are part of the excel file. When a file contains a macro its extension becomes xlsm.
Spreadsheet should be able to import and export xlsm files and edit the macros in them.

RadSpreadsheet should respect negative time values as MS Excel does it.

Currently the following text filters are not supported in the model, filtering popup and Custom Filter dialog:
- begins with
- does not begin with
- ends with
- does not end with
- contains
- does not contain.

All of these are supported in MS Excel.

Add support for import and export of Excel Template files (XLTS) file format.

Allow the customers to work with Shape objects.