title: NGUI can't bring sprite to front in Unity
body: <p>I have a sprite widget in NGUI, and It can't be brought to front what ever the depth I change in the editor:</p>
  
  <p><a href="https://i.stack.imgur.com/3NnRz.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3NnRz.jpg" alt="enter image description here"></a></p>
  
  <p>Note that the orange panel is a scroll view of NGUI.</p>
  
  <p>Here is the inspector setting of the sprite that I want to set to the very front:</p>
  
  <p><a href="https://i.stack.imgur.com/3vQgk.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3vQgk.jpg" alt="enter image description here"></a></p>
  
  <p>And here is the inspector setting that has overlapped the above sprite that I want to make front of it.</p>
  
  <p><a href="https://i.stack.imgur.com/uC9uC.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uC9uC.jpg" alt="enter image description here"></a></p>
  
  <p>And here is the BottomPanel setting</p>
  
  <p><a href="https://i.stack.imgur.com/VknwH.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VknwH.jpg" alt="enter image description here"></a></p>