title: How can I unmask password text box and mask it back to password?
body: <p>How can password textbox that set to :</p>
  
  <pre><code>password_txtBox.PasswordChar ="*"
  </code></pre>
  
  <p>to be unmasked ( from checkbox ) and then mask again<br>
  without loosing the string inside the textbox</p>