private void ViewModelChanged(object sender, DependencyPropertyChangedEventArgs e)
{
this.viewModel_ = this.DataContext as InstrumentSelectorViewModel;
Dictionary<string,InstrumentBaseViewModel>.ValueCollection valueList
= new Dictionary<string, InstrumentBaseViewModel>.ValueCollection(this.viewModel_.PrototypeList_);
this.prototypeDataGrid_.ItemsSource = valueList;
}