title: Y axe always visible
body: <p>I'm drawing a graph like behind using core-plot. I wanted to put de Y axe out of the "plotAreaFrame", like that I'll be able to see it all the time, even when I'm scrolling on the X axe.</p>
  
  <p>If it's not possible could you give me a clue to make the Y Axe always visible. </p>
  
  <p><img src="https://i.stack.imgur.com/0XnUX.png" alt="alt text"></p>
  
  <p>Edit: May I do this by drawing an other chart an displaying only the axes of the second graph and no datas on it?</p>