@param {Object} dragNode [Tree node to be moved]
        @param {Object} dropNode [Tree node destiny]
        @param {Object} callback [Done handler]
        @param {Object} errCallback [Error handler]
      */
      moveNode: function (dragNode, dropNode, callback, errCallback) {
        var el = this;
        var node = typeof dragNode === "string" ? el.nodes[dragNode] : dragNode;
        // Trigger node drop callback
        vcomet.triggerCallback("onNodeMove", el, el, [node, dropNode]);
        // Preve