private void ContinueAddShowingExecute(object obj)
{
ShowingView view = new ShowingView()
{
DataContext = new ShowingViewModel(Showing)
};
ChooseMovieView.GetInstance().Close();
view.Show();
}
private void EditShowingExecute(object obj)
{
ShowingView view = new ShowingView(SelectedShowing);
view.Show();
}