Added Controls testing + documentation

src/myfasthtml/core/dbmanager.py

@@ -39,7 +39,7 @@ class DbObject:
   
   def __init__(self, owner: BaseInstance, name=None, db_manager=None):
     self._owner = owner
-    self._name = name or self.__class__.__name__
+    self._name = name or owner.get_full_id()
     self._db_manager = db_manager or DbManager(self._owner)
     
     self._finalize_initialization()
@@ -112,6 +112,7 @@ class DbObject:
         setattr(self, k, v)
     self._save_self()
     self._initializing = old_state
+    return self
   
   def copy(self):
     as_dict = self._get_properties().copy()