The problem when setting dataGridView.dataSource from CollectionView

Dear Gurus!

In windows form application I am trying to set DataGridView.DataSource:

dc = new myEntities();
_masterObservableCollection = new ObservableCollection<object>(dc.fires);
masterView = (CollectionView)CollectionViewSource.GetDefaultView(masterObservableCollection);
dataGridView.DataSource = masterView;

After that I am see that dataGridVies.DataSource has more than 3000 items. But on the form I see empty DataGridView.

When I use 

dataGridView.DataSource = dc.fires;