Currently, the ControlPanelItem expose only standard CLR properties. Make them DependencyProperties so they can be data bound.

When exporting there are several ways of telling the exporting class which column to exclude during export (through options or by cancelling the export of the column in an event). It would be easier if there was an "IsExportable" property on GridViewDataColumn so that the export can take that into account. No options or events would then be necessary when exporting.

Introduce a GridViewTimeSpanColumn for handling properties of the TimeSpan type.

We can consider introducing functionality that allows users to conditionally style/format the control in a similar manner as the WinForms feature: https://docs.telerik.com/devtools/winforms/controls/gridview/cells/conditional-formatting-cells.

Using SearchPanel and getting search results highlighted is a very usefull feature. However at the moment it is only possible to change the color of the highlight-portion of HighlightTextBlock. It would be nice if I have more formatting options like:

• HighlightFontWeight
• HighlightFontStyle

etc. So if I search for "find" I get results like "find me"

When there isn't a vertical scrollbar visible, while performing a drag selection, empty rows appear.

Provide a way to change the ItemsSource of the control while it is exporting using SpreadStreamExport.RunExportAsync() method

When using Entity Framework Core 3 an InvalidOperationException is received upon adding an AggregateFunction to a column. 

GridViewSpreadStreamExport throws exception exporting the control whit nested column groups and EnableColumnGroupsVirtualization set to False.

Currently, when you scroll the RadGridView control the "click here to add new row" button goes out of the viewport. Allow to pin the button, so it float at the top or bottom of the viewport and to be always visible.

Add mechanism to exclude columns from exporting when using GridViewSpreadStreamExport

When sorting a grouped RadGridView, the selection is lost. 

The user wants an API with which he can set a formula. For example, the string "=A1+B1" will be translated in Excel like a formula.

Implement a way to group columns cells vertically.

When you have rows grouped by null value and you try to move one of the rows to another group, a NullReferenceException is thrown.

This is reproducible only when DataView is used as ItemsSource of RadGridView.

To work this around, avoid using null values. Or avoid using DataView.

The background of the cells is exported when the ExportDefaultStyles property of the GridViewSpreadStreamExportOptions to False.

Add support for different merged cells orientation - MergedCellsOrientation.Mixed could be added.

Apply sort/filter/group. Add option so that user can disable the UI update and be able to add new items, remove existing ones, change values so that UI is not updated. For example new item is on top of the sorted ones. Edite item does not change its place until sorting is reapplied/ resumed.

Loading items in RadGridView takes too much time due to operations executed on the UI. 

The GroupRenderMode of the RadGridVIew is set to Flat. The control is populated with items that implement the IList interface. The Count property of the custom objects needs to return value bigger than 1. So when the Delete button is pressed, the rows beneath the deleted one will also be deleted. Their number depends on the Count property of the custom object.