iOS Question Bar Buttons similar to SideMenuController

I use the createbarbuttons function call on the SideMenuController to create a button that look like three bars.

This works fine, but I wanted to add these to the layout in the designer, but could not find the same option when choosing button type. Am I missing something?

I have found a work around by adding them in code whenever I load a layout but was hoping for a neater solution.

Cheers
Brian