title: RichTextBox SelectionFont change back
body: <p>I create RichTextBox and I got this code:</p>
  
  <pre><code>richTextBox1.SelectionFont = new Font("Verdana", 10, FontStyle.Regular);
  richTextBox1.SelectionColor = Color.Blue;
  richTextBox1.Text += "ddddd";
  </code></pre>
  
  <p>The text stay the same. I notice that richTextBox1.Text change my font back to the default font.
  How can I fix it?</p>