title: How to show alert message in Event Listener
body: <p>I want to put an alert message on my Listener:</p>
  <pre class="lang-php prettyprint-override"><code>if ($type == '-'){
      if ($balance &lt; $amo) {
          flash()-&gt;overlay('Warning!', 'Amount is higher than Balance.', 'warning');
      } else {
          $wallet-&gt;users()-&gt;updateExistingPivot($uid, [&quot;balance&quot; =&gt; ($balance - $amo)]);
      }
  } else {
      $wallet-&gt;users()-&gt;updateExistingPivot($uid, [&quot;balance&quot; =&gt; ($balance + $amo)]);
  }
  </code></pre>
  <p>But this <code>flash()</code> does not seem to be working. I mean, it does not show the message <code>Amount is higher than Balance.</code>.</p>
  <p>So how to print this message properly via the Listener?</p>