Hi ladys and gentleman...
Finally i got it!
$nodeExtra = $navigation->add('Node 1');
$subNode= $nodeExtra->add('Node 1.1');
$subNode->add('Link', 'http://link');
Now i have a new question. I have a custom node which is a link of another plugin. Then, i need put the "Node 1" after this node.
Ever the "Node 1" stay before of my another custom node.
See:
|Home
|Courses
|Node 1 <-------- Is before my custom node
|Custom Node
Then i need like this:
|Home
|Courses
|Custom Node
|Node 1 <-------- After