/// <summary>
 /// Calls the vector potential calculator form.
 /// </summary>
 private void vectorPotentialFormButton_Click(object sender, EventArgs e)
 {
     if (VectorPotentialCalculator.Instance == false)
     {
         VectorPotentialCalculator form = new VectorPotentialCalculator(this);
         form.Show(this);
         VectorPotentialCalculator.Instance = true;
     }
     else if (VectorPotentialCalculator.Instance)
     {
         // Do nothing.
     }
 }
        private void calculateVectorButton_Click(object sender, EventArgs e)
        {
            switch (VectorPotentialCalculator.Instance)
            {
            case false:
            {
                var form = new VectorPotentialCalculator(this);
                form.Show(this);
                VectorPotentialCalculator.Instance = true;
            }
            break;

            case true:
                break;
            }
        }