private void StepUpButton_Clicked(object sender, EventArgs e)
    {
        double value;
        for (int i = 0; i < 30; i++)
        {
            if (GetEntries(i).IsFocused)
            {
                if (String.IsNullOrEmpty(GetEntries(i).Text) || GetEntries(i).Text.Equals("-"))
                {
                    value = 0.00;
                }
                else
                {
                    value = Convert.ToDouble(GetEntries(i).Text);
                }
                for (int j = 0; j < 10; j++)
                {
                    if (GetEntries(i) == GetVa1ToVb1Amp(j))
                    {
                        GetVa1ToVb1Amp(j).Text = controller.StepUpClicked(0, value).ToString("F2");
                    }
                    if (GetEntries(i) == GetIa1ToIb3Amp(j))
                    {
                        GetIa1ToIb3Amp(j).Text = controller.StepUpClicked(1, value).ToString("F3");
                    }
                    if (GetEntries(i) == GetVa1ToIb3Phase(j))
                    {
                        GetVa1ToIb3Phase(j).Text = controller.StepUpClicked(2, value).ToString("F2");
                    }
                    if (GetEntries(i) == GetVa1ToIb3Freq(j))
                    {
                        GetVa1ToIb3Freq(j).Text = controller.StepUpClicked(3, value).ToString("F3");
                    }
                }
            }
        }
    }