When I insert an image in a worksheet it shown and I can print it. But when I export the worksheet to a PDF file the image is not exported!

Implement UI for hiding sheet. The sheets can be visible, hidden, or very hidden (could be made visible only from the API).

Note: This is already supported on model level (in RadSpreadProcessing).

Implement Show Formulas command, which display the formulas in the cells instead of the result value. In MS Excel, this is available in Formulas -> Formula Auditing -> Evaluate Formula.

The keyboard shortcut is "Ctrl + ~".

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.

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).

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).

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.

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.

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

The fix is available in our latest LIB release (v.2015.3.1026). 

The feature will be available in our official release Q1 2016.

Add API allowing change of the mouse cursor.

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.

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

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.

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

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());