title: Set transparent window background in Titanium desktop app
body: <p>I need to set the background of a window to be transparent programmatically, once the window is already created.</p>
  
  <p>This creates a new window with a transparent background.</p>
  
  <pre><code>Titanium.UI.createWindow({url:location.href,transparentBackground:true}).open()
  </code></pre>
  
  <p>Background transparency can also be set in the tiapp.xml, but I need to set it <em>after</em> the window is loaded.</p>
  
  <p>I also tried the following</p>
  
  <pre><code>var win = Titanium.UI.getCurrentWindow();
  win.backgroundColor = 'transparent';
  </code></pre>
  
  <p>which does not have any effect...</p>
  
  <p>Is there a way to achieve that? </p>