code: void firePropertyParentChanged(N node, N oldParent, N newParent) {
  		firePropertyParentChanged(new TreeNodeParentChangedEvent(node, oldParent, newParent));
  	}
docs: Fire the event for the changes node parents.
  
  @param node is the node for which the parent has changed.
  @param oldParent is the previous parent node
  @param newParent is the current parent node