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.

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.

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

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

Selecting multiple columns that are not necessarily next to each other leads to incorrect chart series categories. Having the same columns next to each other and selecting all of them with single selection results in a correct chart. Make it possible for the user to make multiple selections and create charts based on them.

Spreadsheet :Export/Import of merged cells from several columns leads to - 'A' is invalid row name error

With the current implementation, the Notes support only a rectangular shape.

Examples:

The MergeAndCenter command binding in the SpreadsheetRibbon causes a NullReferenceException.

Introduce support for row/column reordering via the UI

Provide a way to display function name that is different than the actual names saved in the XML.

Provide an easy way to bind or set the ApplicationName in the ribbon

TickLabelPosition is skipped on importing documents containing charts. When the Value axis has both positive and negative values being able to specify tick labels' position makes the chart readable, otherwise, labels are positioned in the middle of the chart. There are four positions - High, Low, NextTo and None.

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

Enable users to localize the default styles names.

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