private void makeButton_Click(object sender, RoutedEventArgs e)
 {
     int periodNum = 0;
     Int32.TryParse(txtPeriod.Text, out periodNum);
     if (periodNum >= 2 && periodNum <= 6)
     {
         var temp = new blinkingWindow(periodNum, txtColor1.Text, txtColor2.Text);
         temp.Show();
         windows.Add(temp);
     }
 }
        private void makeButton_Click(object sender, RoutedEventArgs e)
        {
            int periodNum = 0;

            Int32.TryParse(txtPeriod.Text, out periodNum);
            if (periodNum >= 2 && periodNum <= 6)
            {
                var temp = new blinkingWindow(periodNum, txtColor1.Text, txtColor2.Text);
                temp.Show();
                windows.Add(temp);
            }
        }