iconClassNameRight="muidocs-icon-navigation-expand-more" not work

Question

All:

I am pretty new to Material-UI, when I follow the first example in components section, the expand more icon on right side of AppBar not shown up( that down arrow ):

http://www.material-ui.com/#/components/app-bar

I have already included:

<link href='https://fonts.googleapis.com/css?family=Roboto:400,300,500' rel='stylesheet' type='text/css'>
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">

and set style:

  html, body {
    width:100%;
    height:100%;
    padding:0px;
    margin:0px;
    font-family: 'Roboto', sans-serif;
  }

Any help?

Answer 1

That classname is from the material ui documentation website.

https://github.com/callemall/material-ui/issues/2526