income even though the code to display a button on the header did not appear and the code it out of utoriales of ionic, I'm doing wrong?
<ion-header-bar class="bar-positive">
<h1 class="title">Contacts</h1>
<div class="buttons">
<button class="button button-icon ion-compose" ng-click="modal.show()">
</button>
</div>
</ion-header-bar>
<ion-content has-header="true">swdw</ion-content>
</ion-view>