@@ -0,0 +1,357 @@
+package edu.mit.csail.uid;%0A%0Aimport javax.swing.JWindow;%0A%0Apublic class TransparentWindow extends JWindow %7B%0A   public void setOpacity(float alpha)%7B%0A      if( Env.getOS() == OS.MAC )%0A         getRootPane().putClientProperty(%22Window.alpha%22, new Float(alpha));%0A      else if( Env.getOS() == OS.WINDOWS )%0A         Win32Util.setWindowOpacity(this, alpha);%0A%0A   %7D%0A%7D%0A

add TransparentWindow