title: Cocos2D: how to tweak CCMenuItem with only one sprite?
body: <p>how could I tweak CCMenuItemSprite to support only one sprite?</p>
  
  <p>Currently I have:</p>
  
  <pre><code>[CCMenuItemSprite itemWithNormalSprite:one selectedSprite:selectedOne] 
  </code></pre>
  
  <p>But would like to have:</p>
  
  <pre><code>[CCMenuItemSprite itemWithNormalSprite:one] 
  </code></pre>
  
  <p><strong>EDIT: I want to modify CCMenuItem to work only with one CCSprite and not two. So I need to change also the internal methods.</strong>  </p>