private void txtMin_LostFocus(object sender, RoutedEventArgs e)
        {
            txtMin.Text = txtMin.Text.Replace("-", "");

            if (txtMin.Text.Equals(""))
            {
                txtMin.Text = "MIN";
            }
            else
            {
                if (Sanitizer.ValidAmount(txtMin.Text))
                {
                    if (!txtMax.Text.Equals("MAX"))
                    {
                        if (Double.Parse(txtMin.Text) > Double.Parse(txtMax.Text))
                        {
                            validAmountRanges = false;
                        }
                        else
                        {
                            validAmountRanges = true;
                        }
                    }
                }
                else
                {
                    txtMin.Text = "MIN";
                }
            }
        }