//Add two UIBarButtonSystemItemFlexibleSpace items to your toolbar, to the left and right of your items
UIBarButtonItem *flexibleSpaceLeft = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *flexibleSpaceRight = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
[toolbar setItems:[NSArray arrayWithObjects:flexibleSpaceLeft, settingsButton,deleteButton,aboutButton, flexibleSpaceRight, nil]];
[flexibleSpaceLeft release];
[flexibleSpaceRight release];
//Adding ...
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