title: cocos2dx - sub layer that covers its parent partially keep capturing all touches
body: <p>In my cocos2dx game, I have a CCLayer that contains another CCLayer. The sublayer just cover part of the container layer. I 'think' I achieve this through:</p>
  
  <p><code>this-&gt;setContentSize( CCSizeMake( 100, 200 ) );</code></p>
  
  <p>however, the sublayer always capture touches even though it is outside its size and position area... Is it common?</p>
  
  <p>I can filter through the touches position by comparing it inside the ccTouch*<em>*</em> functions, but I think it is a hack, what is the proper way to set the sublayer to properly cover just the partial area of its parent?</p>