title: cant add a shape layer into a view's layer
body: <p>I'm working on <code>CAShapeLayer</code> by creating a layer using CAShapeLayer like following:</p>
  
  <pre><code>CAShapeLayer *shapeLayer = [CAShapeLayer layer];
  shapeLayer.frame = CGRectMake(150, 50, 200, 200);
  shapeLayer.fillColor = [UIColor whiteColor].CGColor;
  shapeLayer.strokeColor = [UIColor orangeColor].CGColor;
  [self.view.layer addSublayer:shapeLayer];
  </code></pre>
  
  <p>However, when I execute the codes and I cant see my <code>shapeLayer</code> in the simulator/device.<br>
  What I am missing here. </p>
  
  <p>PS : If I am using <code>CALayer *shapeLayer = [CALayer layer];</code> it works.Confused</p>