Adding items to a navigation toolbar
<p>I have a navigation toolbar in which I am adding toolbar items programatically, as below.  The toolbar displays properly, and the toolbar style is set to black opaque. but the button on the toolbar does not display.  Why?  </p>

<pre><code>    //Set up the toolbar
 [[[self navigationController] toolbar] setBarStyle:UIBarStyleBlackOpaque]; 
 UIBarButtonItem *myButtonItem = 
 [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(handleMyButton)];
 NSArray *myItems = [NSArray arrayWithObjects: myButtonItem,nil];
 [[self navigationController] setToolbarItems:myItems animated:NO];
 [myButtonItem release];
</code></pre>
