In this case, we have an enum column. When the DataFilter dialog is shown and we click to enter the filter value, an exception is thrown.

In this case, we have a GridViewHyperlinkColumn in which we have a cell with an empty string or null value. Exporting the control in XLSX format leads to an exception.

This only happens initially when you first start checking/unchecking rows. See the attached gif file.

Call stack:

Telerik.WinControls.GridView.dll!Telerik.WinControls.UI.GridGroupHeaderRowElement.Initialize(Telerik.WinControls.UI.GridViewRowInfo rowInfo) Line 100
	at Telerik.WinControls.UI\GridGroupHeaderRowElement.cs(100)
Telerik.WinControls.GridView.dll!Telerik.WinControls.Export.GridExportUtils.GetRowHeight(Telerik.WinControls.UI.RadGridView radGridView, Telerik.WinControls.UI.RowElementProvider rowProvider, Telerik.WinControls.UI.CellElementProvider cellProvider, Telerik.WinControls.UI.GridViewRowInfo gridViewRowInfo, bool exportVisualSettings) Line 158
	at Telerik.WinControls.Export\GridExportUtils.cs(158)
Telerik.WinControls.GridView.dll!Telerik.WinControls.Export.GridViewSpreadExport.AddRow(Telerik.WinControls.UI.GridViewRowInfo gridViewRowInfo, int rowIndex) Line 960

In this case, the cell contains the following string: körte. When copying the cell while it is in non-edit mode, and pasting the value in another cell, the pasted string is the following one: körte

Checking the select column header cell won't select the rows that are hidden. Thus in a grouping scenario, the group checkbox to an intermediate state. This will lead to confusion that there are still un-selected items, while all visible items are selected.

The current behavior clears the selection when doing so.

1. Group by some column or create hierarchy.
2. Select all from the parent header check box or in the header.
3. Expand parent row
4. As a result, the row expands, but selection disappears.

In this case, we have GridViewCalculatorColumn. The cell value is 123, for example. Trying to edit the cell value, the RadCalculatorEditor reset the cell value to 0. 

In this case, we have null values in some cells. When filtering the column, these cells will be ignored. 

While the Excel-Like filtering dialog is open and the mouse is over the RadGridView rows, moving the mouse wheel will scroll both the filtering dialog and the rows.

EndEdit() method is not called of IEditableObject if an exception is thrown while setting a null value to the bound property

In this case, the RadGridView is in the Self-Reference hierarchy. When the value of a cell is changed runtime, we are populating the bound (BindingList) collection with new items. All BindingList notifications will be called, however, the internal RadListSource in the RadGridView won't be updated, thus leading to a ArgumentOutOfRangeException.

In the description of the RowIndent property is mentioned that this will indent groups and hierarchy rows.  However, it can indent group rows only. 

Holding CTRL + C on a cell for a couple of seconds will throw ExternalException. 

In this scenario, the Browsable(false) attribute is set to both properties which are used to create the self-referencing hierarchy. When the columns are predefined, running that application will freeze as the RadGridView could not correctly get the parent row. If the columns are auto-generated, this behavior is not observed. 

This is not exactly a real solution as setting the Browsable(false) attribute will remove the properties from the source. However, the control should not freeze the application.

The Excel-like filter in the SelfReference hierarchy is slow.

To reproduce the issue:
Click the first cell of a column
Scroll down and press Shift key and click the last cell of the column
Check that total rows label is 20.000 but selected cells label is less than 19.997