title: onPress called on load
body: <p>I have added a function to the <code>onPress</code> method but the function is automatically triggered on loading the app. Am I doing something wrong?</p>
  
  <pre><code>&lt;TouchableHighlight onPress={this.showMenu()}&gt;
     &lt;View&gt;&lt;/View&gt;
  &lt;/TouchableHighlight&gt;
  
  showMenu(){
     this.state.showMenu = true;
  }
  </code></pre>