I managed to reproduce the behavior, however, it is caused due to a limitation in the Silverlight framework and its element measuring mechanism so there is not a convenient workaround that I can suggest. As you might have noticed, moving the scrollbar would cause the RadGridView to redraw correctly, so you can apply the following change in the ColumnWidthChanged
sender, ColumnWidthChangedEventArgs e)
var scrollbar = clubsGrid.ChildrenOfType<GridViewScrollViewer>().Where(x => x.Name==
scrollbar.ScrollToHorizontalOffset(scrollbar.HorizontalOffset + 1);
This will cause the scrollbar to move slightly and limit the glitch to be visible only while your users hold the column splitter.
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