title: Navigation drawer creates a shadow on the image button when drawer is dragged
body: <p>I am having trouble when trying to drag navigation drawer on top of an image button. When the drawer button is dragged at first, it creates a shadow on the top of image button and then the drawer comes out. How to stop drawer creating a shadow on top of my imagebutton?</p>
  
  <p>When the navigation drawer is pulled from left:
  <img src="https://photos-1.dropbox.com/t/0/AAAQkakGPxJYug2ews7E4ncBp0XPulAS4wnmBixU7EOLnA/12/65385095/png/1024x768/3/1409418000/0/2/Screenshot_2014-08-30-21-00-34.png/S-WqHGqghuh6DEwfRCmcK9pZjDLoM9gFWQSiJ4_RKkM" alt="Navigation drawer on top of camera preview"></p>
  
  <p>When the navigation drawer is completely on the screen:
  <img src="https://photos-3.dropbox.com/t/0/AADxaqVMGfc1clGZBDY_xUaAJWt-MU2O-sK2JLb53tPkFw/12/65385095/png/1024x768/3/1409418000/0/2/Screenshot_2014-08-30-21-00-42.png/7EwoqHniIceZgowQ-58gKA3Vo2C1l42671E_sLM5kG8" alt="Navigation drawer when getting dragged"></p>
  
  <p>Also, please note that Imagebutton has no shadows on its own when drawer is closed.Please help me. I need to fix it immediately. I tried searching a lot but the solution i found make imagebutton background null or transparent color, which is not helping me here as imagebutton background only gets screwed when drawer is pulled out.</p>