title: UIPopoverController too large and UIPickerView too small
body: <p>I have a <code>UIPickerView</code> displayed inside a <code>UIPopoverController</code>.  The dimensions of the <code>UIPickerView</code> are: <code>320x216</code>.  For some reason, the <code>UIPickerView</code> seems to be ~3/5 of the proper height, and the <code>UIPopoverController</code> spans all the way down to the bottom of the screen.</p>
  
  <p>Please see the code below.</p>
  
  <p>Thanks!</p>
  
  <pre><code>self.picker = [[[UIPickerView alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height+44, 320, 216)] autorelease];
  self.picker.backgroundColor = [UIColor clearColor];
  self.picker.showsSelectionIndicator = YES;
  self.picker.delegate = self;
  self.picker.dataSource = self;
  self.picker.transform = CGAffineTransformMakeScale(-1, 1);
  UIViewController *pickerController = [[UIViewController alloc] init];
  [pickerController setView:self.picker];
  UIPopoverController *pickerPopover = [[UIPopoverController alloc] initWithContentViewController:pickerController];
  [pickerPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
  pickerPopover.delegate = self;
  self.popover = pickerPopover;
  [pickerController release];
  [pickerPopover release];
  </code></pre>