I finally find a workaround.
The issue is the order to set the values. If is set:
self.documentItemsTable.dataSource = self.documentItemsTable;
self.documentItemsTable.delegate = self.documentItemsTable;
self.documentItemsTable.styleClass = @"posTable";
It fails. However if set:
self.documentItemsTable.styleClass = @"posTable";
self.documentItemsTable.delegate = self.documentItemsTable;
It work. In fact, if the delegate is not set it not work, or if set before the styleClass.