title: Changing tooltips in a custom view
body: <p>I've got a sample project at:</p>
  
  <p><a href="http://ericgorr.net/cocoadev/tooltip.zip" rel="nofollow">http://ericgorr.net/cocoadev/tooltip.zip</a></p>
  
  <p>What I would like to do is define a single tooltip rect for an entire view but be able to change the tooltip as the cursor moves inside of the view.</p>
  
  <p>Is there a way to do that? Is there a way to force it to hide the current tooltip and display a new one while calling view:stringForToolTip:point:userData:?</p>
  
  <p>I could create my own window that simulates a real tooltip, but wanted to make sure there was nothing built-in that would support this.</p>