title: ExtJs Drag drop tree, get drop Position
body: <p>I have drag drop tree</p>
  
  <p>and this is the viewConfig property</p>
  
  <pre><code>viewConfig: {
      plugins: {
          ptype: 'treeviewdragdrop',
          appendOnly: true
      },
      listeners: {
          beforedrop: function (node,data,overModel,dropPosition,dropFunction,options){console.log(overModel)}
      }
  
  },
  </code></pre>
  
  <p>I have two tree grid, what i want to get dropTarget position. Eg. Before node 3, after node 5...just like that</p>
  
  <p>Anyone can help me?</p>
  
  <p>Thanks</p>