Changed order of Delete and base.SetItem so that the correct event, NotifyCollectionChangedAction.Remove, is raised to notify UI.  bugid: 1038
Changed order of Delete and base.SetItem so that the correct event, NotifyCollectionChangedAction.Remove, is raised to notify UI. 
bugid: 1038


rockfordlhotka/csla,jonnybee/csla,BrettJaner/csla,ronnymgm/csla-light,ronnymgm/csla-light,ronnymgm/csla-light,jonnybee/csla,BrettJaner/csla,rockfordlhotka/csla,JasonBock/csla,rockfordlhotka/csla,JasonBock/csla,BrettJaner/csla,MarimerLLC/csla,MarimerLLC/csla,JasonBock/csla,jonnybee/csla,MarimerLLC/csla