I can't remove summary rows in grouped mode.

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# Context:
- We have a grid ​with a group filter
- User add "​Count" to summary row top
- Summary row is added, with the ​Count
- User remove the ​"Count" from the summary row top

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# Behavior:
- ​The summary rows ​themselves ​still displayed empty (the "Count" element have just been removed);
- There are no problems when there is no grouping, the summary rows are correctly removed;
- Adding a group (manually or programmatically) resolves the problems, maybe forcing the grid to refresh;

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# Actual ​Code:
private void RemoveSummaryRowTop(string strFunction, string headerText)
{
    //Here we remove item from the summary
    _grid.MasterTemplate.SummaryRowsTop.ForEach(summaryRow => summaryRow
        .Where(row => row.Aggregate.ToString() == strFunction && row.Name == headerText).ToList()
        .ForEach(x => summaryRow.Remove(x)));

    //Here we remove empty summary rows
    _grid.MasterTemplate.SummaryRowsTop.Where(x => x.Count == 0).ToList()
        .ForEach(x => _grid.MasterTemplate.SummaryRowsTop.Remove(x));
}

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# Notes:
- Everything seems correct while debugging ... item is correctly found and removed from summary row, then empty summary row is found and removed correctly from SummaryRowsTop. As a result, there is nothing left (count = 0) in _grid.MasterTemplate.SummaryRowsTop

- We observed also that when scrolling to content a bit bottom there are no empty summary rows. We are ​supposing this is some content which has not been loaded before ​scrolling. Since summary rows are not displayed here, we clearly thing about a bug with telerik UI update.

- ​We're using version 2015.1.331.40
- I've tested same code with latest version 2015.2.728

---------------------------
# Tried:
- _grid.Refresh();
- _grid.MasterTemplate.Refresh();
- _grid.Update();
- _grid.ResetBindings();
- _grid.Invalidate();
- _grid.MasterTemplate.SummaryRowsTop.Clear();
- _grid.SummaryRowsTop.Clear();
- _grid.TableElement.Update(GridUINotifyAction.Reset);
- _grid.TableElement.Update(GridUINotifyAction.ResetView);

---------------------------
# Only way it ​works is adding and removing a group (seems to force refresh of the view):
private void RemoveSummaryRowTop(string strFunction, string headerText)
{
    //Here we remove item from the summary
    _grid.MasterTemplate.SummaryRowsTop.ForEach(summaryRow => summaryRow
        .Where(row => row.Aggregate.ToString() == strFunction && row.Name == headerText).ToList()
        .ForEach(x => summaryRow.Remove(x)));

    //Here we remove empty summary rows
    _grid.MasterTemplate.SummaryRowsTop.Where(x => x.Count == 0).ToList()
        .ForEach(x => _grid.MasterTemplate.SummaryRowsTop.Remove(x));

    //Here we add then remove a group to force grid refresh
    GroupDescriptor descriptor = new GroupDescriptor();
    descriptor.GroupNames.Add("DESC_SERVICE", ListSortDirection.Ascending);
    _grid.GroupDescriptors.Add(descriptor);
    _grid.GroupDescriptors.Remove(descriptor);
}

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