title: UIPickerView with Date only rotating in one direction
body: <p>I am experiencing a strange behavior with a UIPickerView:</p>
  
  <p>I am trying to show an Date Picker within an action sheet.
  Everything works well, except that the wheels are only rotating in one direction at first!</p>
  
  <p>If you start rotating up and change the direction to down - it works. But when you try to start rotating down, the picker won't move.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"Date Picker" 
                                                    delegate:self
                                           cancelButtonTitle:@"Abbrechen"
                                      destructiveButtonTitle:nil
                                           otherButtonTitles:@"Auswählen",nil];    
      // Add the picker
      UIDatePicker *tmpPickerView = [[UIDatePicker alloc] init];
      tmpPickerView.datePickerMode = UIDatePickerModeDate;
  
      [tmpPickerView addTarget:self
      action:@selector(pickerChanged:)
      forControlEvents:UIControlEventValueChanged]; 
  
      [menu addSubview:tmpPickerView];              
      [menu showInView:self];        
  
      CGRect menuRect = menu.frame;
      menuRect.origin.y -= 214;
      menuRect.size.height = 300;
      menu.frame = menuRect;
  
      CGRect pickerRect = pickerView.frame;
      pickerRect.origin.y = 174;
      pickerView.frame = pickerRect;
  
      [tmpPickerView release];    
      [menu release];
  </code></pre>