title: How to add a Tilemap to a prefab?
body: <p>I have a <code>Bomb</code> prefab that gets dinamically added to the center of a 2D tile on keypress via a <code>BombSpawner</code> script. When the bomb explodes, I want it to affect multiple tiles in my <code>Ground</code> tilemap.</p>
  
  <p>The explosion is inside the <code>BombController</code> script which is part of my <code>Bomb</code> prefab. I tried accessing the tilemap by adding it manually to the prefab:</p>
  
  <pre><code>public Tilemap tilemap;
  </code></pre>
  
  <p>But it doesn't work. I can only drag and drop the tilemap to the <code>Bomb</code> when it's in the scene, not to the prefab.</p>
  
  <p>Is there a way to access the <code>Ground</code> tilemap inside the <code>BombController</code> script?</p>