private void btnEditStreet_Click(object sender, RoutedEventArgs e)
{
StreetsView view = new StreetsView();
StreetsViewModel street = (StreetsViewModel)((Button)sender).DataContext;
street.OperationType = OperationType.Update;
view.DataContext = street;
view.ShowDialog();
}
private void btnAddStreet_Click(object sender, RoutedEventArgs e)
{
StreetsView view = new StreetsView();
StreetsViewModel street = new StreetsViewModel();
street.Cities = (CitiesViewModel)DataContext;
street.OperationType = OperationType.Insert;
view.DataContext = street;
view.ShowDialog();
}