I can explain this behaviour in xceed wpf data grid demo.....Steps to reproduce... 1. open this link       http://download3.xceedsoft.com/demo/gridwpf/Xceed.Wpf.DataGrid.Samples.LiveExplorer.xbap 2.  Click on displaying data. 3. Click on ''Ship Via'' Column to sort it in Descending Order. 4. Scroll the vertical bar to the top so as to reach ...