I have a problem with appearing scrollbars for hierarchical view when AutoFit is used. I found very old thread which was redirecting to Microsoft site with resolution which unfortunately is already dead.
I've also created sample application. How to resolve scrolling multiple problems?
Sample application: InfragisticsSample.Application.zip
Update: the vertical scroll bar is not shown due minWidth setting for data grid. However, the horizontal is not appearing at all once expanded row and later still calculates width incorrectly.
After long play around I found resolution option. The change is trivial: use for all child table columns Width=Auto option. So adjusting last data grid to have width Auto solved display problem. So this is not a bug in the Microsoft.
<igDP:Field Name="CellInstanceVersion" Label="Active version" Width="Auto" /> </igDP:FieldLayout.Fields>