private void EqualsBtn_Click(object sender, RoutedEventArgs e)
 {
     CalcDisplay.ShowAnswer(CalculatorDisplay);
 }
 private void CloseParenBtn_Click(object sender, RoutedEventArgs e)
 {
     CalcDisplay.UpdateDisplay(')', CalculatorDisplay);
 }
 private void Button_Click_1(object sender, RoutedEventArgs e)
 {
     CalcDisplay.UpdateDisplay('.', CalculatorDisplay);
 }
 private void DivBtn_Click(object sender, RoutedEventArgs e)
 {
     CalcDisplay.UpdateDisplay('/', CalculatorDisplay);
 }
 private void ThreeBtn_Click_1(object sender, RoutedEventArgs e)
 {
     CalcDisplay.UpdateDisplay('3', CalculatorDisplay);
 }