title: Textbox display formatting
body: <p>I want to add "," to after every group of 3 digits. Eg : when I type 3000000 the textbox will display 3,000,000 but the value still is 3000000.<br>
  I tried to use maskedtexbox, there is a drawback that the maskedtexbox displayed a number like <strong><em>_</em>,__<em>,</em>__</strong> .</p>