Well, thanks to Microsoft and their infinite inconsistency on their combo, we made a change a LONG time ago that swaps the DropDownState based on the editing state so the contol would look the same in a disabled state.  However, I do not think that we ever set it to Simple (I will verify this).  However, I was unable to reproduce the behavior you described.  If you could post a sample reproducing this it would be helpful.  Thanks!