title: How can I send a "UIControlEventValueChanged" event from my custom control?
body: <p>I've created a custom picker view type of control by subclassing UIView. I would like to be able to send a "UIControlEventValueChanged" control event from within this control, so that I can register for it in whichever view controller is using the control.</p>
  
  <p>How can I can I get my custom control to trigger this event when I deem it should be triggered?</p>