title: javascript calendar pop up not working
body: <p>I am trying get Javascript popup calendar control to work which doesnt work.  I am getting </p>
  
  <p>an error "Microsoft JScript runtime error: 'window.opener.document.forms(...).control' is null or not an object".  Here is my event,</p>
  
  <pre><code>protected void Change_Date(System.Object sender, System.EventArgs e)
  {
      string strScript = "&lt;script&gt;window.opener.document.forms(0)." + control.ClientID + ".value = '";
          strScript += calDate.SelectedDate.ToString("MM/dd/yyyy");
          strScript += "';self.close()";
          strScript += "&lt;/" + "script&gt;";
  
          ClientScript.RegisterClientScriptBlock(this.GetType(), "Startup", strScript);
  }
  </code></pre>
  
  <p>It displays the calendar fine but when I click on the date, I am getting the error and the date is inserted into the textbox.</p>