title: CCNode override draw() method not working
body: <p>I want to draw some customized opengl elements, like <code>ccdrawline()</code>. According to cocos2d documentation, I should override <code>draw()</code> method to draw my stuff in my subclassed layer. However it is not working. While if I override the <code>visit()</code> method, I can see what I want to draw. I am puzzled about this and I am seeking for ideas for solving this.</p>
  
  <p>I made it like this:</p>
  
  <pre><code>- (void)draw
  {
    [super draw];
    CGPoint a = ccp(0,0);
    CGPoint b = ccp(480,320);
    ccDrawLine(a,b);
  }
  </code></pre>