The default set of WPF UI controls measured in infinity results in the minimal size of the control. RadSpreadsheet should behave the same. This will help users to find out what is happening while debugging.

DataValidationRule is persisted after pasting a cell value which is copied from a cell without DataValidationRule applied. 

For example: Cell A1 has data validation rule applied. The cell A2 doesn't have. The value from cell A2 is copied to cell A1. The result is that cell A1 still has data validation, but it shouldn't.

LocalizableException with text "Format string is not in the correct format.", with inner ArgumentException "Format string is not in the correct format." is thrown. 

Currently the validation doesn't allow number format string starting with date or time formatting to have more that one section (for negative and zero numbers). Excel allows this type of number formats and if you set format like dd/mm/yyyy;[RED](#.##0); the positive numbers are visualized as dates, but negative numbers are visualized as numbers and their fore color is red.

Examples (including the final semicolons):

- ss;

- dd;

- dd/mm/yyyy;;

- mmm-yy;mmm-yy;_-* "-"??_-;_-@_-

When number format ends with N commas, the resulting number should be divided to 1000 N times. Instead, such commas are ignored. 

For example, if the format is #.0,, and the value of the cell is 12,200,000, the number should be displayed as 12.200.0

Implement options in fill handle which enable to choose the type of the auto filling, as in MS Excel. 

After drag-drop of the fill handle, a small UI control (drop down button like) appears which enables the users to choose whether the cell data should be copied, filled using series or other. Another option (also available in MS Excel), is to drag the fill handle with the right mouse button, which shows window with options.

Improve the editing in RadSpreadsheet with IME (input method editors). 

Problematic scenarios:

- Start typing:
When Japanese IME is chosen (for example) and the user starts typing while a cell is selected, the CellEditor should be in EditMode - the same behavior as if you are typing in English.

- Committing:
When the user is already in EditMode and typing with the Japanese IME, suggestions are listed in a popup. The user can than commit the sentence by selecting some of the suggested words with the mouse (by double-clicking on the suggestion) everything is correct and you continue to be in EditMode. However, if the user navigates to the suggestion and hit Enter (which is the most used case and it is somehow the native one) the editor goes out from EditMode to Inactive.

The MouseWheel event currently is handled in RadWorksheetEditorPresenterBase without a check if the Handled property is set to true.

Data validation does not validate values if they are not set using the cell editor. Pasting or auto-fill of invalid values will not produce data validation warning.

Among the other worksheet protection options, the customers can choose options like "Select locked cells" and "Select unlocked cells", enable or disable formatting options, insertion or deletion of different elements. These settings at the moment are not supported

Add API allowing change of the mouse cursor.

Currently indexed colors are imported only regarding the default color palette. Instead, when the entire palette is predefined using construct like:

  <colors>
    <indexedColors>
      <rgbColor rgb="00000000"/>
      ...

in styles.xml part, the indexed should be changed with the provided ones.

As this feature is not implemented, such colors are changed during the import.

Implement pop-up providing analysis options and quick access to formatting for the selected range of cells. 

Implement AutoSum command and functionality. In MS Excel, it is located in Home -> Editing -> AutoSum drop down, and allows fast creation of formula over the selected cell, by choosing a formula: SUM, AVERAGE, COUNT, MAX, MIN, etc. If a range is not selected, the command tries to predict which sells have be included.

Through the sorting options, the user can set sort orientation (to sort by rows or by columns) and whether the sort should be case sensitive.

Images inserted in RadSpreadsheet are resized when the active sheet is changed. The set size is very small, making them almost invisible.

Workaround: Remove the two RadNumericUpDowns in the Picture contextual tab in the ribbon UI. They can be recognized by their bindings, to SetShapeWidth.SelectedValue and SetShapeHeight.SelectedValue respectively.

Steps to reproduce:
- Open RadSpreadsheet with the default Ribbon UI present.
- Insert image using the button in the Ribbon -> Illustrations -> Pictures.
- Add new sheet using the Sheet Selector (+) button, or change the sheet to another sheet
- Return to the initial sheet.

Expected: The image retains its original size.
Actual: The image size is changed to very small one.

Add support for formats which can present numbers with non-arabic numerals, for example:
 
- Bengali - [$-bn-IN,500]0
- Devanagari - [$-hi-IN,400]0
- East Arabic - [$-ar-SA,200]0
- Persian - [$-ar-SA,300]0
- Gujarati - [$-gu-IN,700]0
- Kannada - [$-kn-IN,B00]0
- Khmer - [$-et-EE,1200]0
- Lao - [$-lo-LA,E00]0
- Malayalam - [$-ml-IN,C00]0
- Mongolian - [$-mn-MN,1300]0
- Burmese - [$-my-MM,1000]0
- Oriya - [$-or-IN,800]0
- Tamil - [$-ta-IN,900]0
- Telugu - [$-te-IN,A00]0
- Thai - [$-th-TH,D00]0
- Tibetan - [$-bo-CN,F00]0

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

If you set "[h]:mm" as a custom format to a cell which has time set to it the calculated value in the cell is wrong for the minutes. The minutes part is interpreted as months.

The number format [hh]:mm causes ArgumentException on import.

Add support for pivot tables.