Implement functionality to rotate the text in a cell.

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.

At this point, the formatting can be applied only to the whole cell content.

XLSB is binary format that should theoretically allow fast reading and writing to the file. 

Hello, 
we have an Excel export in our software that we solved via Telerik Spreadsheet. 
An exported Excel Table can also contain images. 
These pictures are inserted as shape objects. 
The Placement Property is set to xlMove (xlPlacement Enum) in Excel. 
If you now filter the data in Excel, the images remain and are not hidden. 
We therefore need a way of being able to change this Placement Property to the Value xlMoveAndSize
It would be very desirable if this option were made available in Telerik Spreadsheet as our customers urgently need it.

Add support for pivot tables.

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

- Async parse of single xml file to speed-up the import
- Allow to import only part of the file
- Respect the widths of the columns and row heights and do not measure them first time in the WorksheetLayout or measure them for the current Viewport only
- Inserting rows/columns also need improvements in terms of performance.

Grouping is a mechanism to organize data in sections, in order to be able to show and hide the relevant chunks.

Each row or column which is part of a group is assigned an outline level, which determines the level of grouping and from there which rows or columns it is grouped with. 

Enable copy-paste of content from and to Excel, preserving all of the applied formatting, styles and images.

Currently, RadSpreadsheet supports only CSV for exchanging clipboard data with Excel, and all formatting (including number formats and data validation) is lost.

Add support for text orientation (rotation). This is supported in the SpreadProcessing model.

Add support for creating Tables and applying tables styles (predefined ones or custom).

Currently, the customers can bind data only to the Workbook property of RadSpreadsheet. Allow them binding cell range to a data source.

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.

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

Implement support for ChartSheet 

In MS Excel, there is splitter that can be used to manually resize the formula bar. Also there is an arrow button which expands/collapses the formula bar to the last manually resized size. 

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

Currently, the chart's appearance can be customized through the model API. Let the user be able to customize it using the UI.