Similar to the one in RadPivotGrid:
https://docs.telerik.com/devtools/wpf/controls/radpivotgrid/features/localdatasourceprovider/serialization

And here is an online demo:
https://demos.telerik.com/silverlight/#PivotGrid/Serialization

Available in LIB version 2017.3.1127, it will be also available in the R1 2018 Release.

Available in LIB version 2017.3.1127, it will be also available in the R1 2018 Release.

When applying VQCV with custom IEnumerable as a source to the ItemsSource of the grid and filters grid through filtering control, ExportToXlsx exports wrong items.

Available in LIB version 2017.3.1127, it will be also available in the R1 2018 Release.

Added the CanUserSearchInHiddenColumns property which indicates whether users can search for content in hidden columns. The property is available with our 2017.3.1127 internal build.

Available in LIB version 2017.3.1113, it will be also available in the R1 2018 Release.

When setting the VirtualItemCount on refreshing the data source, the scrollbar jumps to the top. If the VirtualItemCount is initially set, the behavior is not reproduced. The workaround is to use the scrolling mechanism of the control and scroll back to the desired item.

In an application, I bind a DataTable with many rows to a RadGridView. As soon as, the datatable is binded, I see the memory needed by the application growing. The problem is that the binding is done each time the content of the DataTable is changing. It seems that the memory is never cleared and keep growing until a MemoryException is thrown. This does not appear with a WPF standard GridView. Do you know why ?

Currently, you can use only the predefined one - IsEqual, IsNotEqual, etc. Add an option to create operators that execute custom filtering action. Also, add support for modifying the default operators.

I have a RadGridView and bind its ItemsSource and its SelectedItem to properties of the ViewModel (DataContext). When the ViewModel is created, the property bound to ItemsSource is filled and the property bound to SelectedItem is set to one of the items in the collection.

However, when the GridView is displayed, the property is first set to null and then set to the first item in the collection. I assume that the binding of the SelectedItem is evaluated before the binding of the ItemsSource, so the grid is empty and the desired item can't be selected. Is there any way to influence the order, in which the binding are evaluated? Or is there any other way to avoid that the SelectedItem is changed?

A similar issue is described here: http://www.telerik.com/forums/selecteditem-binding-issue
Unfortunately, I couldn't to find the support ticket mentioned in this thread.

Add option in GridViewDocumentExportOptions to include / exclude GroupHeaderRowAggregates.

This will allow users to hide/show group header row aggregates in the exported documents.

Option will be globbally applied - to all group header rows in the RadGridView.
===
From 2017 R3 SP GridViewDocumentExportOptions  adds ShowGroupHeaderRowAggregates bool property.

It can be used like so:

  GridViewDocumentExportOptions options = new GridViewDocumentExportOptions()
            {
                ShowGroupHeaderRowAggregates = true
            };
this.gridView.ExportToWorkbook(options);

Currently, the aggregate results in the GroupHeaderRow are not aligned according to the columns whose value they summarize. We can introduce such functionality which will require modifying the control template of the GroupHeaderRow.

Completed in R3 2017.

Edit:
We are declining this bug as originally the export options were not meant to respect group properties but only some global GridView properties.
However we will add such option in GridViewDocumentExportOptions class.
You can follow this feature request => 
https://feedback.telerik.com/Project/143/Feedback/Details/229211-gridview-add-option-in-gridviewdocumentexportoptions-to-include-exclude-grouph

Same as the one available in Excel. Please check the attached screenshot.

Currently, the following workaround can be applied:

private void RadGridView_Loaded(object sender, RoutedEventArgs e)
{
	var gridView = sender as RadGridView;
	foreach (var column in gridView.Columns)
	{
		if (!column.IsResizable)
		{
			Dispatcher.BeginInvoke((Action) (() =>
			{
				var radGridView = column.Parent;
				foreach (var header in radGridView.ChildrenOfType<GridViewHeaderCell>())
				{
					if (header.Column.DisplayIndex == column.DisplayIndex)
					{
						var leftGripper = header.ChildrenOfType<Thumb>().Where(x => x.Name == "PART_LeftHeaderGripper").First();
						{
							leftGripper.Visibility = Visibility.Collapsed;
						}
					}
					else if (header.Column.DisplayIndex == (column.DisplayIndex - 1))
					{
						var rightGripper = header.ChildrenOfType<Thumb>().Where(x => x.Name == "PART_RightHeaderGripper").First();
						{
							rightGripper.Visibility = Visibility.Collapsed;
						}
					}
				}
			}), DispatcherPriority.Render);
		}
	}
}