A few comments added

vizro-core/src/vizro/_vizro.py

@@ -149,6 +149,8 @@ def _pre_build():
         for _, filter_obj in list(model_manager._items_with_type(Filter)):
             # Run pre_build on all filters first, then on all other models. This handles dependency between Filter
             # and Page pre_build and ensures that filters are pre-built before the Page objects that use them.
+            # This is important because the Page pre_build method checks whether filters are dynamic or not, which is
+            # defined in the filter's pre_build method.
             filter_obj.pre_build()
         for model_id in set(model_manager):
             model = model_manager[model_id]

vizro-core/src/vizro/models/_page.py

@@ -97,6 +97,8 @@ def __vizro_exclude_fields__(self) -> Optional[Union[set[str], Mapping[str, Any]
     @_log_call
     def pre_build(self):
         targets = model_manager._get_page_model_ids_with_figure(page_id=ModelID(str(self.id)))
+
+        # TODO NEXT: make work generically for control group
         targets.extend(control.id for control in self.controls if getattr(control, "_dynamic", False))
 
         if targets: