when scrollbar position is at the bottom, the 1st row in the view disappears on reloading the RadGridView

[dharmesh]

Implemented the behavior to adjust the scroll position so that the selected item will appear on the top in the view.

code for above behavior:
                        var scrollOffset = gridView.Items.IndexOf(SelectedItem) * gridView.RowHeight;

                        //get the scrollviewer control
                        var scrollViewer = gridView.ChildrenOfType<Telerik.Windows.Controls.GridView.GridViewScrollViewer>                                                                     ().First();

                        // scrollbar position
                        var verticalOffset = scrollViewer.VerticalOffset;
                        var viewportHeight = scrollViewer.ViewportHeight;

                        if (scrollOffset > verticalOffset || scrollOffset > (verticalOffset + viewportHeight))
                        {
                            scrollViewer.ScrollToVerticalOffset(scrollOffset);
                        }

 

11 items are there in the view. If 3rd last item is selected.
Steps performed to reproduce the issue:
1. Scrolled down to the bottom.
2. restarted the application and opened the view which contains radgridview.
3. above code for scroll item to top executed on the loading of radgridview.
4. please refer the attached image which shows issue.

Disappeared row appears again on scrolling the radgridview.

If Virtualization row is turned off, this issue does not reproduce but it kills the performance.

Need to get another solution for this issue.

[Martin Ivanov]

Can you set the GroupRenderMode property of RadGridView to Flat and see if the issue still persist? If so, I would recommend you to send over a sample project reproducing the issue.

[dharmesh]

After setting  GroupRenderMode=Flat the issue is not reproducible now. 
Thanks for the solution.

[dharmesh]

After setting  GroupRenderMode=Flat, above mentioned issue is fixed but the behavior to adjust the scroll position so that the selected item will appear on the top in the view is not working on sorting. 
I have share code snippet in above question.

[Martin Ivanov]

Can you tell me when do you execute the above mentioned code? I mean what event or on what action do you call the logic?

In the meantime, you can try to save the VerticalOffset of the ScrollViewer when the Sorting event is fired and then restore it on Sorted.