<AppBar
  title="Title"
  iconClassNameRight="muidocs-icon-navigation-expand-more" />

<AppBar
  title={<span>Title</span>}
  iconElementLeft={<IconButton><NavigationClose /></IconButton>}
  iconElementRight={<FlatButton label="Save" />} />

<AppBar
  title="Title"
  iconElementLeft={<IconButton><NavigationClose /></IconButton>}
  iconElementRight={
    <IconMenu iconButtonElement={
      <IconButton><MoreVertIcon /></IconButton>
    }>
      <MenuItem primaryText="Refresh" />
      <MenuItem primaryText="Help" />
      <MenuItem primaryText="Sign out" />
    </IconMenu>
} />
