Implement mechanism for disabling, enabling or changing of the commands of the CellEditor classes, like Copy and Paste.

NullReferenceException is thrown when the VisibleSize property of RadSpreadsheet is set more than once on two (or more) adjacent lines. For example:

spreadsheet.VisibleSize = new SizeI(1, 1);
spreadsheet.VisibleSize = new SizeI(5, 5);

To work this around you can increase the time between the settings of the VisibleSize property. For example you can use the ActiveSheetEditorChanged event of RadSpreadsheet and the ActivePresenterChanged event of the ActiveWorksheetEditor, and the UIUpdated event of the ActivePresenter. Each time the VisibleSize is changed, the ActiveWorksheetEditor will be recreated along with its ActivePresenter. You should make sure the second, third, etc. setting of the VisibleSize is executed after the new ActivePresenter is loaded. This can be done in the UIUpdated event.

When the VisibleSize property of the spreadsheet control is set (for example new SizeI(10, 10)) and column is selected via its header (click on it), the IsColumnSelection property of the ActiveWorksheetEditor's Selection returns False. This applies also for the IsRowSelection property.

If plain text is pasted in a cell, and the text is automatically recognizable as date, number, percentage, formula or other format, the text is always converted to the recognized number format.

Instead, the cell's current number format should affect the convertion in the following way:
- If the current format is General -> parse the value with the automatically recognized format, and set the value with the automatically recognized format
- If the current format is Text -> set the value as text, and preserve the current format (Text)
- If the current format is any other format -> try parse the value with the current format
  - Successful -> set the parsed value with the current format
  - Unsuccessful -> parse the value with the automatically recognized format, and set the parsed value with the current format.

As a result, strings which are recognizable as dates, for example, are pasted as their numeric representation instead of with their Date formatting. Also it's not possible to paste something as plain text. 

Workaround: for always pasting plain text: Create custom Paste button and executes the following code:
this.radSpreadsheet.ActiveWorksheetEditor.Selection.Cells.SetValueAsText(Clipboard.GetText());

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.

If a document contains many and complex formulas (with many functions having other functions as arguments) it may take a long time to show in the control.

When setting the following strings as cell value, they are recognized as dates. In industry standard applications like MS Excel and OpenOffice, they are recognized as strings:
- "12 3456" in bg-BG, fr-FR, ru-RU, sv-FI, en-US
- "12.3456" in de-DE
- "1 23" in en-US
- "2013/5" in en-US
- "3000-03" in en-US

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.

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

When the PrintPreview has to show many UIElements at once, the performance is slow.

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

It would be useful to allow the printer to be chosen directly from the Print Preview control (in the File menu in the ribbon UI). Currently the user should first press Print, and then can choose the printer in the Printer dialog, which is inconvenient.

ArgumentException is thrown ("Error: Argument1" message box in case of importing through RadSpreadsheet) when importing document containing cell with applied custom data validation rule restricting the value of the cell to empty values only - '""' (two double quotes).

Add API for notification when the value in a cell determined by formula is changed. This way the user can find whether by changing a cell value the result of a formula that refers to that cell value is changed.

For example:

A1: 100
A2: 5
A3: =A1+A2

When A2 is changed, the notification should be rise for A3 (as its value is also changed).

When importing a document containing a destination that does not refer to a formula an exception is thrown: System.NullReferenceException: 'Object reference not set to an instance of an object.'

I would like to be able to hide a selected column. In excel this can be achieved by right clicking the header of a column and selecting Hide/Unhide. Actually the same goes for rows.

Borders can overhang 1 px from the corresponding cells. The issue is reproducible only on some zoom levels, and is most probably related to WPF layout rounding. The issue is mostly visible when borders are missing. 

On different zoom levels, different borders are hanging.

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.

The fix will be available in our latest LIB release (v. 2015.02.0803).