Improved command management to reduce the number of instances

src/myfasthtml/controls/TreeView.py

@@ -267,6 +267,12 @@ class TreeView(MultipleInstance):
     self._state.update(state)
     return self
   
+  def get_bag(self, node_id: str):
+    try:
+      return self._state.items[node_id].bag
+    except KeyError:
+      return None
+  
   def _toggle_node(self, node_id: str):
     """Toggle expand/collapse state of a node."""
     if node_id in self._state.opened: