Add drop shadow to slide out navigation
<p>I have implemented slide out navigation using <a href="https://github.com/gitgrimbo/android-sliding-menu-demo" rel="nofollow">this</a>. <img src="http://i.stack.imgur.com/zAgEh.png" alt="current implementation"></p>

<p>The content should drop shadow near menu list's right edge; like <img src="http://i.stack.imgur.com/mK76B.png" alt="expected result"> </p>

<p>I'm trying to add shadow by adding a view to content left edge, but it wont show up.</p>

<p>Any clue on how to do this will be appreciated.</p>
