index.js

render() {
  return (
    <View style={styles.panel}>
    <VrButton
      onClick={this.incrementCount}
      style={styles.greetingBox}
    >
      <Text>+</Text>
    </VrButton>
    <VrButton
      onClick={this.decrementCount}
      style={styles.greetingBox}
    >
      <Text>-</Text>
    </VrButton>
    <Text style={styles.greeting}>
      {`Count: ${this.state.count}`}
    </Text>
  </View>
  );
}