title: ExtJS: Applying a Messagbox only to a specific window (modal)?
body: <p>I have the following code and while it is working, the modal part is over the entire browser window.  I have create my own xtype: window and wish to only have it affect this part. I have tried RenderTo but that produces strange results.</p>
  
  <p>Does anyone know how? </p>
  
  <p>Here is my existing code:</p>
  
  <pre><code>msg.show({
      msg: 'Attempting to create account...',
      progressText: 'creating...',
      width:420,
      wait:true,
      waitConfig: {interval:150}
  });
  </code></pre>