Why does UIBarButtonItem in navigation bar appears disabled?

I have a UITabBarController with 4 UINavigationControllers in it. I successfully added a right UIBarButtonItem in the navigation bar of one of the controllers but it appears disabled and I can't click it. I've already tried to set enable property to true but nothing works...
Did someone already had the same problem? I'm struggling with this for hours...
Here's the code:
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(socialShare)];
And a screenshot:
I'll be waiting for an answer.
Thanks for your help!

Are you within these guidlines?
Before creating a navigation interface, you need to decide how you intend to use a navigation interface. Because it imposes an overarching organization on your data, you should only use it in these specific ways:
Install it directly as a window’s root view controller.
Install it as the view controller of a tab in a tab bar interface.
Install it as one of the two root view controllers in a split view interface. (iPad only)
Present it modally from another view controller.
Display it from a popover. (iPad only)

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Why does UIBarButtonItem in navigation bar appears disabled?

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