title: Wix react-native-navigation change Tab and push screen
body: <p>How can I simultaneously switch tab and push screen?
  When the button is pressed,
  I would like to switch to another tab and push a new screen.
  Is it possible? </p>
  
  <pre><code>class Example extends Component {
        buttonHandler = () =&gt; {
          this.props.navigator.switchToTab({
            tabIndex: 0
          });
          this.props.navigator.push({  // actually this navigator's tabIndex is 0 
            screen: "dc.Examplecreen",
            title: "Exampe", 
            passProps: {
              lesson : this.props
            }    
         });
     }
  }
  </code></pre>