I can open an excel file and see its content

src/myfasthtml/controls/TabsManager.py

@@ -164,13 +164,14 @@ class TabsManager(MultipleInstance):
     self._add_or_update_tab(tab_id, label, component, activate)
     return tab_id
   
-  def show_tab(self, tab_id, activate: bool = True, oob=True):
+  def show_tab(self, tab_id, activate: bool = True, oob=True, is_new=True):
     """
     Send the tab to the client if needed.
     If the tab was already sent, just update the active tab.
     :param tab_id:
     :param activate:
     :param oob: default=True so other control will not care of the target
+    :param is_new: is it a new tab or an existing one?
     :return:
     """
     logger.debug(f"show_tab {tab_id=}")
@@ -190,7 +191,9 @@ class TabsManager(MultipleInstance):
       logger.debug(f"  Content not in client memory. Sending it.")
       self._state.ns_tabs_sent_to_client.add(tab_id)
       tab_content = self._mk_tab_content(tab_id, content)
-      return self._mk_tabs_controller(oob), self._mk_tabs_header_wrapper(), self._wrap_tab_content(tab_content)
+      return (self._mk_tabs_controller(oob),
+              self._mk_tabs_header_wrapper(),
+              self._wrap_tab_content(tab_content, is_new))
     else:
       logger.debug(f"  Content already in client memory. Just switch.")
       return self._mk_tabs_controller(oob)  # no new tab_id => header is already up to date
@@ -204,7 +207,7 @@ class TabsManager(MultipleInstance):
     
     self._add_or_update_tab(tab_id, label, component, activate)
     self._state.ns_tabs_sent_to_client.discard(tab_id)  # to make sure that the new content will be sent to the client
-    return self.show_tab(tab_id, activate=activate, oob=True)
+    return self.show_tab(tab_id, activate=activate, oob=True, is_new=False)
   
   def close_tab(self, tab_id: str):
     """
@@ -359,11 +362,15 @@ class TabsManager(MultipleInstance):
       cls="dropdown dropdown-end"
     )
   
-  def _wrap_tab_content(self, tab_content):
-    return Div(
-      tab_content,
-      hx_swap_oob=f"beforeend:#{self._id}-content-wrapper",
-    )
+  def _wrap_tab_content(self, tab_content, is_new=True):
+    if is_new:
+      return Div(
+        tab_content,
+        hx_swap_oob=f"beforeend:#{self._id}-content-wrapper"
+      )
+    else:
+      tab_content.attrs["hx-swap-oob"] = "outerHTML"
+      return tab_content
   
   def _tab_already_exists(self, label, component):
     if not isinstance(component, BaseInstance):