Hello Fábio,
To dock the panels as they are in the attached image, you need to use one of the DocumentManager.AddDocument overloads.
When you first add a NUIDocument to the DocumentManager.Documents collection it initialize an ActiveGroup property which will holds the panels that are added to the Documents collection without specifying the group explicitly.
When you add the rest of the panels you should specify the group they will reside and how they should be docked.
Please, check the code snipped below which shows how you can achieve the desired state of the panels:
NUIDocument doc1 = new NUIDocument("Doc1");
NUIDocument doc2 = new NUIDocument("Doc2");
NUIDocument doc3 = new NUIDocument("Doc3");
NUIDocument doc4 = new NUIDocument("Doc4");
NDocumentManager documentManager = nDockManager1.DocumentManager;
//This will create documentManager.ActiveGroup which we will use below.
documentManager.AddDocument(doc1);
NDocumentHost activeGroup = documentManager.ActiveGroup;
nDockManager1.DocumentManager.AddDocument(doc2, activeGroup, DockStyle.Fill);
nDockManager1.DocumentManager.AddDocument(doc3, activeGroup, DockStyle.Right);
nDockManager1.DocumentManager.AddDocument(doc4, activeGroup.RootZone, DockStyle.Bottom);
Best Regards,
Nevron Support Team