Izzilab:material-ui IconMenu not rendering MenuItem(s)

I am using izzilab:material-ui package and its working great with react.

But IconMenu is not showing up MenuItem(s)

var IconMenu = MUI.IconMenu;
var IconButton = MUI.IconButton;
var MenuItem = MUI.MenuItem;
<IconMenu iconButtonElement= {iconBtnElem} > <MenuItem primaryText="Refresh" /> <MenuItem primaryText="Send feedback" /> <MenuItem primaryText="Settings" /> <MenuItem primaryText="Help" /> <MenuItem primaryText="Sign out" /> </IconMenu>

I can see the IconButtonElement, when I tap on it, I see only empty Menu.