Change ActionBar Title Font

Hi all, how are people changing the font of their actionbar title?

I came across this: http://www.tristanwaddington.com/2013/03/styling-the-android-action-bar-with-a-custom-font/

But the last line of code causes an issue in mono:

actionBar.setTitle(s);

In mono SetTitle only accepts an int parameter type, are we missing a method?

Cheers