Add another example

examples/element-factory/src/alert-button.jsx

@@ -0,0 +1,20 @@
+import { useState } from 'react';
+
+export const AlertButton = ({}) => {
+  const [message, setMessage] = useState('Alert!');
+
+  return (
+    <div>
+      <label>
+        Message
+        <input
+          type="text"
+          value={message}
+          onChange={(event) => setMessage(event.target.value)}
+        />
+      </label>
+
+      <button onClick={() => alert(message)}>Trigger Alert</button>
+    </div>
+  );
+};