title: setNeedsDisplay not working?
body: <p>I have a problem redrawing a custom view in simple cocoa application. Drawing is based on one parameter that is being changed by a simple NSSlider. However, although i implement -setParameter: and -parameter methods and bind slider's value to that parameter in interface builder i cannot seem to make a custom view to redraw itself.</p>
  
  <p>The code that does redrawing is like this:</p>
  
  <pre><code>- (void)setParameter:(int)newParameter {
    parameter = newParamter;
    NSLog(@"Updated parameter: %d", parameter);
    [self setNeedsDisplay:YES];
  }
  </code></pre>
  
  <p>I DO get the message about setting the new parameter although the view doesn't redraw itself. Any ideas are welcome!</p>