Ion-select is still showing OK\Cancel buttons with interface="popover"

What am I doing wrong?

  <ion-item>
    <ion-label>Gender</ion-label>
    <ion-select interface="popover">
      <ion-option value="f" selected="true">Female</ion-option>
      <ion-option value="m">Male</ion-option>
    </ion-select>
  </ion-item>