title: Button automatically clicked
body: <p>I have a simple app with a Welcome class that redirects to Select class.
  Select class has 2 buttons.</p>
  
  <p>My problem is that when I redirect to Select class, button are automatically clicked and I have the Alert triggered without clicking.</p>
  
  <p>Do you know how to prevent it ?</p>
  
  <pre><code>//Select.js
  import React, {Component} from 'react';
  import {Platform, StyleSheet, Text, View, Image,ImageBackground, Linking, TouchableOpacity, Alert, Button } from 'react-native';
  import { createStackNavigator, createAppContainer } from "react-navigation"
  
  export default class Select extends React.Component {
  
    displayMessage1(){
      Alert.alert("hello1")
    }
  
    displayMessage2(){
      Alert.alert("hello2")
    }
  
    render() {
      return (
          &lt;View&gt;
            &lt;ImageBackground
                source={require("./images/im1.jpg")}
                style={styles.imageBackground}&gt;
  
                  &lt;View style ={{flex:0.3}}&gt;&lt;/View&gt;
  
                  &lt;View style ={{flex:1}}&gt;
                      &lt;Text style ={styles.text}&gt; myText&lt;/Text&gt;
                  &lt;/View&gt;
  
                  &lt;Button
                    onPress={this.displayMessage1()}
                    title="go message 1"
                    color="#00aaf0"
                  /&gt;
  
                  &lt;View style ={{flex:0.3}}&gt;&lt;/View&gt;
  
                  &lt;Button
                    onPress={this.displayMessage2()}
                    title="go message 2"
                    color="#00aaf0"
                  /&gt;
  
                  &lt;View style ={{flex:1}}&gt;&lt;/View&gt;
  
            &lt;/ImageBackground&gt;
          &lt;/View&gt;
      )
    }
  }
  ```
  </code></pre>