void pl_PersonRemoved(object sender, PersonEventArgs e)
 {
     RemoveViewModelFromList(e.Person);
 }
 void pl_PersonAdded(object sender, PersonEventArgs e)
 {
     if(!IsAlreadyInList(e.Person))
         AddViewModelToList(e.Person);
 }
 void PersonRemoved(object sender, PersonEventArgs e)
 {
     try
     {
         PresentPersons.Remove(e.Person);
     }
     catch { }
     AllPersons.Remove(e.Person);
 }
 void PersonAdded(object sender, PersonEventArgs e)
 {
     AllPersons.Add(e.Person);
 }
 void App_CurrentVendorChanged(object sender, PersonEventArgs e)
 {
     RaisePropertyChangedForAll();
 }
 void App_CurrentVendorChanged(object sender, PersonEventArgs e)
 {
     RaisePropertyChanged("IsCurrentVendorAdmin");
     RaisePropertyChanged("IsChangeFinanceAllowed");
 }