React-native-router-flux: Multiple navigationBar buttons with renderRightButton

[kaifaust]

I want two buttons on the right side of the navigationBar.

I want to be able to pass an array of my buttons like this:
renderRightButton={[this.searchButton, this.newButton]}
but it gives me this error:
this.route.props.renderRightButton.bind is not a function.

Note: padding a single button here that isn't an array works...

[aksonov]

Check docs carefully. renderRightButton is _closure_ (function) not array.

[beebase]

So is it possible to render multiple buttons and where in the docs can I find an example?