title: How to reorder elements in a tree panel using treeviewdragdrop plug in?
body: <p>I have added the following code in my viewConfig. I have also tried creating another ptype and using the same name for dragGroup and dropGroup.
  Any help shall be appreciated. Thanks in advance.</p>
  
  <p>plugins: {
                  ptype: 'treeviewdragdrop',
                  appendOnly: true,
                  ddGroup: 'sampleDDGroup'
              }</p>