When a class is added to grid row at runtime to enable so-called conditional styling, which is based on the values in one or more cells  (e.g. if status="urgent" font color=red) and then the grid is grouped by the user, the added class seems to get lost in the shuffle -- it does not "travel" with the row to its new location and so the conditional styling disappears. I'm not sure what goes on behind the scenes during a grouping operation, but if it is possible to preserve custom classes  added at runtime so that they survive the grouping operation, please implement this feature.