Fixed tab recreation logic and improved error handling

src/myfasthtml/controls/TabsManager.py

@@ -120,15 +120,36 @@ class TabsManager(MultipleInstance):
     if tab_config["component"] is None:
       return Div("Tab content does not support serialization.")
 
-    res =  InstancesManager.get(self._session, tab_config["component"][1], None)
+    # 1. Try to get existing component instance
+    res = InstancesManager.get(self._session, tab_config["component"][1], None)
     if res is not None:
+      logger.debug(f"Component {tab_config['component'][1]} already exists")
       return res
-    
-    try:
-      logger.debug(f"Component not created yet. Need to manually create it.")
-      return InstancesManager.dynamic_get(self._session, tab_config["component_parent"], tab_config["component"])
-    except Exception as e:
-      logger.error(f"Error while retrieving tab content: {e}")
+
+    # 2. Get or create parent
+    if tab_config["component_parent"] is None:
+      logger.error(f"No parent defined for tab {tab_id}")
+      return Div("Failed to retrieve tab content.")
+
+    parent = InstancesManager.get(self._session, tab_config["component_parent"][1], None)
+    if parent is None:
+      logger.error(f"Parent {tab_config['component_parent'][1]} not found for tab {tab_id}")
+      return Div("Parent component not available")
+
+    # 3. If parent supports create_tab_content, use it
+    if hasattr(parent, 'create_tab_content'):
+      try:
+        logger.debug(f"Asking parent {tab_config['component_parent'][1]} to create tab content for {tab_id}")
+        content = parent.create_tab_content(tab_id)
+        # Store in cache
+        self._state.ns_tabs_content[tab_id] = content
+        return content
+      except Exception as e:
+        logger.error(f"Error while parent creating tab content: {e}")
+        return Div("Failed to retrieve tab content.")
+    else:
+      # Parent doesn't support create_tab_content, fallback to error
+      logger.error(f"Parent {tab_config['component_parent'][1]} doesn't support create_tab_content")
       return Div("Failed to retrieve tab content.")
   
   def _get_or_create_tab_content(self, tab_id):