title: How can i open popup window in ExtJS with formpanel only
body: <p>I have the Form panel which constains the form with fields.</p>
  
  <p>Now on click of button , i am opening the window and then adding form as item in window like this</p>
  
  <pre><code>win = new Ext.Window({
      title: 'Add',
      layout: 'fit',
      autoScroll: true,
      y: 120,
      width: 600,
      height: 600,
      modal: true,
      closeAction: 'hide',
      items: [formpanel]
  });
  win.show();
  </code></pre>
  
  <p>Now this shows two windows one shows the main window title <code>Add</code> and border and then one more frame of formpanel with title and borders.</p>
  
  <p>Is there any way so that window only conatins form title and border but not windows title and border and background</p>
  
  <p>Its like showuing only formPanle as popup , rather than formpanel inside window</p>