tried to fix a dreadful bug - after many chnages of selected item in the list the right part stops to update (although the view model gets the change)
not needed classes removed
dreadful bug fixed causing views to stop updating - notyfying in reeactiveobject makes use of weak references which can end really badly. details here:
http://stackoverflow.com/questions/12355087/wpf-mvvm-databindings-stop-updating