Silverlight 3 DataGrid (w/ PagedCollectionView) RowGroupHeaderStyles not reapplied on sort

I am trying to use a DataGrid with hidden group row headers (so that there is a sort boundary). My style simply sets the visibility to collapsed (and I also am setting the SublevelIndent to 0开发者_StackOverflow中文版 during the LoadingGroup event). Initial display is exactly what I want, but the data grid is sorted the appearance is unstyled, and the default indent is apparent. (When debugging the style is still present, and the sublevelindent still says 0).

I encountered this in the past also. I beleive you have to attach the LoadingRowGroup event and reset applicable properties on the e.RowGroupHeader.