title: How can I add one leaflet marker to multiple layergroups?
body: <p>I´m adding markers to layergroups via:</p>
  
  <pre><code>var lGroup1 = new L.FeatureGroup(),
      lGroup2 = new L.FeatureGroup(),
      lGroup3 = new L.FeatureGroup();
  
  new compMarker([50.07045,8.24660]).bindPopup('&lt;p&gt;Something&lt;/p&gt;').addTo(lGroup1).on('click', onClick);
  new compMarker([50.07045,8.24660]).bindPopup('&lt;p&gt;Something&lt;/p&gt;').addTo(lGroup2).on('click', onClick);
  new compMarker([50.07045,8.24660]).bindPopup('&lt;p&gt;Something&lt;/p&gt;').addTo(lGroup3).on('click', onClick);
  </code></pre>
  
  <p>As you can see, I´m adding one and the same marker (identical content) to three layer-groups. Is there a way to do that without generating three identical markers? I´d like to add one but into multiple layer-groups.</p>
  
  <p>I already tried this with no luck:</p>
  
  <pre><code>new compMarker([50.07045,8.24660]).bindPopup('&lt;p&gt;Something&lt;/p&gt;').addTo(lGroup1,lGroup2,lGroup3).on('click', onClick);
  </code></pre>
  
  <p>Any help would be greatly appreciated!</p>