Hmm for this, I would do this.
<ion-nav-bar class="bar-positive">
<ion-nav-back-button class="button-icon ion-arrow-left-c">
</ion-nav-back-button>
</ion-nav-bar>
<ion-header-bar class="bar-subheader">
<button class="button">Left</button>
<h1 class="title">Buttons</h1>
<button class="button">right</button>
</ion-header-bar>