/// <summary>
 /// Copies a JObject into a JArray as first child.
 /// </summary>
 /// <param name="sourceNode"></param>
 /// <param name="targetNode"></param>
 private void DoDragDropMove(JObjectTreeNode sourceNode, JArrayTreeNode targetNode)
 {
     sourceNode.ClipboardCut();
     targetNode.ClipboardPasteInto();
 }
 /// <summary>
 /// Copies a JArray into a JArray as first child.
 /// </summary>
 /// <param name="sourceNode"></param>
 /// <param name="targetNode"></param>
 private void DoDragDropCopy(JArrayTreeNode sourceNode, JArrayTreeNode targetNode)
 {
     sourceNode.ClipboardCopy();
     targetNode.ClipboardPasteInto();
 }