RadSpreadsheet should respect negative time values as MS Excel does it.

Add an event that indicates when a hyperlink is clicked.

Xlsx documents with a global filter defined cannot be imported. Message box "The name that you entered is not valid." is shown and internally SpreadsheetNameException is thrown. MS Excel can import such document and even preserve the filter, but do not respect it and doesn't have UI to clear it.

Workaround 1 (includes processing the document with MS Excel):
- Open the document in MS Excel
- Choose Formulas -> Defined names -> Named Manager
- Choose Filter -> Names with errors
- Find all Filter defined names and delete them
- Save the document

Returns a Range object that represents the current region. The current region is a range bounded by any combination of blank rows and blank columns. If we want to be consistent with MS Excel we should implement this property. It is useful for many operations of a region such as filtering(selecting one cell and executing the Filter command should apply it to the current region), sorting, selecting all and etc. This document will be useful: https://docs.microsoft.com/en-us/office/vba/api/excel.range.currentregion.

Filter command should be disabled when a single row or cell is selected. 

Fix available in LIB Version 2018.3.1105.

Customers are reporting an issue when trying to copy content in an application hosted on a remote machine (there are reports using TigerVNC and Citrix).  The exception is thrown from the Clipboard class with a message: OpenClipboard failed (Exception from HRESULT: 0x800401D0 (CLIPBRD_E_CANT_OPEN))

It seems like such a behavior could be reproduced when the clipboard is already opened by another application. Here is a discussion on the matter: https://stackoverflow.com/questions/68666/clipbrd-e-cant-open-error-when-setting-the-clipboard-from-net

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

The functionality would allow to zoom the print preview and scroll the resulting viewport.

A partial implementation of the zooming functionality can be found in the attached file to provide a starting point for a custom implementation.

The PrintPreviewControl refreshes its preview content on change in the SheetPageSetup object. This method would allow on-demand update.

At the moment this can be achieved by changing something in the page setup and restoring it. 

bool printGridlines = this.spreadsheet.Workbook.ActiveWorksheet.WorksheetPageSetup.PrintOptions.PrintGridlines;
this.spreadsheet.Workbook.ActiveWorksheet.WorksheetPageSetup.PrintOptions.PrintGridlines = !printGridlines;
this.spreadsheet.Workbook.ActiveWorksheet.WorksheetPageSetup.PrintOptions.PrintGridlines = printGridlines;

This behavior happens at a specific width of the cell's Column. Using different VerticalAlignment (not Bottom) would workaround this issue.

This item is moved, because it is related to the RadSpreadsheet's model. You can find the corresponding item here: https://feedback.telerik.com/Project/184/Feedback/Details/255960-spreadprocessing-incompatibility-with-microsoft-excel-of-in-document-hyperlinks

When the formula bar is empty and alt + enter is pressed in order to insert a new line, NullReferenceException is thrown. The exception might be reproduced with text in the formula bar, but the caret has to be placed in the end of a run/end of the text.

Fix available in LIB Version 2018.2.820.

In MS Excel, the users can choose between showing the original size of the page and fit it in the window. Expose a similar option in RadSpreadsheet as well.

When the users click on the More Borders option provided in the ribbon UI, the Format Cells dialog opens but the popup of the dropdown is still kept open.

Currently, to change the title of the ribbon, the users need to replace RadSpreadsheetRibbon with its XAML code. Expose a property allowing to do this change directly from RadSpreadsheetRibbon.

When the InsertFunctionDialog is opened and the "Go" button is pressed with many words entered in the search terms field, the performance is so slow that the application appears hanged.

Allow loading of dialogs (SpellCheckAllAtOnce and SpellCheckWordByWord) different than the default ones through MEF. 

Use-cases: set different Width and Height, hide buttons (e.g. AddToDictionary), etc. 

In MS Excel, the users have the option to specify that the data contains a header row. When this option is enabled, the first row of the column is not included in the sorted range. Implement this option in RadSpreadsheet as well.

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.