title: Detecting an NSColorWell's changed selection
body: <p>I have been looking at how to use an <code>NSColorWell</code> in my app, but there doesn't seem to be much documentation on it.</p>
  
  <p>Is there any way to embed a colour picker (such as the <code>NSColorWell</code>/<code>NSColorPanel</code>) directly into my view? When clicking the well, it always presents a new colour picking window. Can this not be embedded somehow?</p>
  
  <p>I have a custom <code>NSButton</code> class to which I am passing the colour from my <code>NSColorWell</code>. To do this, I am having to make the user pick a colour, then click a button to send this colour to my custom class. Is there a way of simply detecting when a new colour is selected directly from the color picker?</p>