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Why my toolbar does not display properly?

See original GitHub issue

simulator screen shot feb 8 2017 20 17 11

Commands executed to install:

npm i react-native-material-ui --save
react-native link react-native-vector-icons
react-native run-ios

index.ios.js

import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  View
} from 'react-native';
import { COLOR, ThemeProvider, Toolbar } from 'react-native-material-ui';
import { Navigator, NativeModules, StatusBar } from 'react-native';

const uiTheme = {
    palette: {
        primaryColor: COLOR.green500,
    },
    toolbar: {
        container: {
            height: 50,
        },
    },
};

const UIManager = NativeModules.UIManager;

const Container = (props) => {
  return (
    <View style={styles.container}>
      {props.children}
    </View>
  );
};

export default class Bar extends Component {
componentWillMount() {
        if (UIManager.setLayoutAnimationEnabledExperimental) {
            UIManager.setLayoutAnimationEnabledExperimental(true);
        }
    }

  render() {
    return (
      <ThemeProvider uiTheme={uiTheme}>
        <Container>
          <StatusBar backgroundColor="rgba(0, 0, 0, 0.2)" translucent />
          <View style={{ backgroundColor: COLOR.green500, height: 24 }} />
          <Container>
            <Toolbar
                key="toolbar"
                leftElement="menu"
                centerElement={'foo'}
            />
          </Container>
        </Container>
      </ThemeProvider>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    // justifyContent: 'center',
    // alignItems: 'center',
    // backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

AppRegistry.registerComponent('Bar', () => Bar);