private void atBtn_Click(object sender, RoutedEventArgs e)
 {
     At atbox = new At();
     atbox.ShowDialog();
     string temp = atbox.returnStr();
     if (temp != "")
     {
         at = temp;
     }
 }
 private void atBtn_Click(object sender, RoutedEventArgs e)
 {
     At at = new At();
     at.ShowDialog();
     string temp = at.returnStr();
     if (temp != "")
     {
         atStr = at.returnStr();
     }
     atBox.Text = atStr;
 }
 private void bAt_Click(object sender, RoutedEventArgs e)
 {
     At atbox = new At();
     atbox.Show();
     string temp = atbox.returnStr();
     tText.Text = temp;
 }