<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="initApp()">

<mx:Script>
 <![CDATA[
  import mx.messaging.AbstractConsumer;
  internal function initApp():void
  {
   
  }
  internal function btnSubmit_click():void
  {
   var request:URLRequest = new URLRequest("login.aspx");
   var variables:URLVariables = new URLVariables();
   variables.username=txtUsername.text;
   variables.password=txtPassword.text;
   request.data = variables;
   request.method = URLRequestMethod.POST;
   navigateToURL(request,"_blank");
  }
 ]]>
</mx:Script>
 <mx:Panel x="25" y="10" width="311" height="200" layout="absolute" title="Login" id="myPanel">
  <mx:Form x="10" y="10" width="100%" height="140">
   <mx:FormItem label="username:" required="true">
    <mx:TextInput id="txtUsername" maxChars="14"/>
   </mx:FormItem>
   <mx:FormItem label="password:" required="true">
    <mx:TextInput id="txtPassword" maxChars="14" displayAsPassword="true"/>
   </mx:FormItem>
   <mx:Button click="btnSubmit_click()" label="submit" id="btnSubmit"/>
  </mx:Form>
 </mx:Panel>
 
</mx:Application>