I got this message in my console:
Failed Context Types: Required context
muiTheme
was not specified inAppBar
AppB
now in the 0.15.0 you can use muiThemeProvider:
...
import getMuiTheme from 'material-ui/styles/getMuiTheme';
import MuiThemeProvider from 'material-ui/styles/MuiThemeProvider';
import MyAwesomeReactComponent from './MyAwesomeReactComponent';
const App = () => (
)
...
So you do not have to provide context to childrens manualy. More info in documentation.