private void addRowMethod(object sender)
        {
            LastIndex++;
            EquationParametersViewModel newEquation = new EquationParametersViewModel(LastIndex + 1);

            newEquation.R = 1;
            EquationList.Add(newEquation);
        }
 private void calculateMethod(object sender)
 {
     for (int i = 0; i < EquationList.Count; i++)
     {
         EquationParametersViewModel currentEquation = EquationList[i];
         currentEquation.Result = (GRAVITATION_CONSTANT * currentEquation.M1 * currentEquation.M2) / Math.Pow(currentEquation.R, 2);
     }
 }
 /// <summary>
 /// Initializes a new instance of the MainViewModel class.
 /// </summary>
 public MainViewModel(IDataService dataService)
 {
     LastIndex    = 0;
     EquationList = new ObservableCollection <EquationParametersViewModel>();
     while (LastIndex < 3)
     {
         EquationParametersViewModel equation = new EquationParametersViewModel(LastIndex + 1);
         equation.R = 1;
         EquationList.Add(equation);
         LastIndex++;
     }
     LastIndex--;
     populateButtons();
 }