private void generateLeagueButton_Click(object sender, RoutedEventArgs e)
        {
            //todo catch-try block
            if (viewModel.CheckNameInput(newLeagueNameTextBox.Text))
            {
                viewModel.NewLeagueName = newLeagueNameTextBox.Text;
            }
            else
            {
                throw new ArgumentException();
            }

            if (!viewModel.TrySetYearInput(newLeagueYearOfStartTextBox.Text))
            {
                throw new ArgumentException("Year incorrect.");
            }

            viewModel.TeamsForNewLeague = targetTeamsListBox.Items;

            bool scheduleGenerated = viewModel.GenerateSchedule();

            if (scheduleGenerated)
            {
                MessageBox.Show("League sucessfully generated.");
            }
            else
            {
                MessageBox.Show("League not generated.");
            }
        }