title: Masked Edit Extender Format Issue
body: <p>I am using an ASP.NET AJAX Masked Edit Extender to format phone numbers</p>
  
  <pre><code>&lt;asp:TextBox ID="tbPhoneNumber" runat="server" /&gt;
  
  &lt;ajaxToolkit:MaskedEditExtender TargetControlID="tbPhoneNumber" Mask="(999)999-9999" MaskType="Number"
   InputDirection="LeftToRight" ClearMaskOnLostFocus="false" ClearTextOnInvalid="false" runat="server" AutoComplete="false" /&gt;
  </code></pre>
  
  <p>On the page load event I am trying to populate the phone textbox as follows:</p>
  
  <pre><code>    protected void Page_Load(object sender, EventArgs e)
      {
          tbPhoneNumber.Text = "(394)456-310";
      }
  </code></pre>
  
  <p>So there is one number which is missing at the end to make it a valid phone number. When the page loads I expected the value in the textbox to be (394)456-310_ But it displays (_39)445-6310    Why is this happening?</p>