private void SaveButton_Discret_Click(object sender, RoutedEventArgs e)
        {
            int countOfIntervals = Convert.ToInt32(IntervalsText_Discret.Text);
            int numOfColumn      = ColumnCombo_Discret.SelectedIndex;

            if (numOfColumn < 0)
            {
                MessageBox.Show("Wybierz kolumnę");
            }
            else
            {
                Discretization.DoDiscretization(numOfColumn, countOfIntervals);
                //odświeżenie widoku - wyświetlenie zmian
                DisplayNewDataInMenu(numOfColumn + 1);
            }
        }