diff --git a/geos-trame/src/geos/trame/app/core.py b/geos-trame/src/geos/trame/app/core.py
index 1f66b96ab..fff5a29b7 100644
--- a/geos-trame/src/geos/trame/app/core.py
+++ b/geos-trame/src/geos/trame/app/core.py
@@ -121,7 +121,7 @@ def deck_ui( self ) -> None:
                         self.deckEditor = DeckEditor(
                             source=self.tree,
                             classes="ma-2",
-                            style="flex: 1; height: 100%;",
+                            style="flex: 1; height: 100vh;",
                         )
 
                     with vuetify.VCol(
diff --git a/geos-trame/src/geos/trame/app/deck/tree.py b/geos-trame/src/geos/trame/app/deck/tree.py
index c27918b5e..132e617be 100644
--- a/geos-trame/src/geos/trame/app/deck/tree.py
+++ b/geos-trame/src/geos/trame/app/deck/tree.py
@@ -139,7 +139,7 @@ def to_xml( obj: BaseModel ) -> str:
             attribute_name_generator=text.camel_case,
         )
 
-        config = SerializerConfig( indent="  ", xml_declaration=False )
+        config = SerializerConfig( indent="  ", xml_declaration=False, ignore_default_attributes=True )
         serializer = XmlSerializer( context=context, config=config )
 
         return format_xml( serializer.render( obj ) )
diff --git a/geos-trame/src/geos/trame/app/ui/editor.py b/geos-trame/src/geos/trame/app/ui/editor.py
index dc5b4f5b2..62b06302d 100644
--- a/geos-trame/src/geos/trame/app/ui/editor.py
+++ b/geos-trame/src/geos/trame/app/ui/editor.py
@@ -81,12 +81,24 @@ def _on_active_id( self, active_id: str | None, **_: Any ) -> None:
             self.state.active_type = None
             self.state.active_types = []
             return
+        
 
+        # read from the tree
         active_block = self.tree.decode( active_id )
 
         simput_type = type( active_block ).__name__
 
-        self.simput_manager.proxymanager.get_instances_of_type( simput_type )
+        #TODO (Q1) why the return is not used ??
+        # sim_item = self.simput_manager.proxymanager.get_instances_of_type( simput_type )
+        #update proxy with decoded data
+
+        self.simput_manager.proxymanager.commit_all()
+        # proxy = self.simput_manager.proxymanager.get(active_id)
+        # if not proxy:
+        #     return
+        # for k,v in dict(active_block).items():
+        #     proxy.set_property(k,v)
+        # proxy.commit()
 
         self.state.active_id = active_id
         self.state.active_ids = [ active_id ]
diff --git a/geos-trame/src/geos/trame/app/ui/timeline.py b/geos-trame/src/geos/trame/app/ui/timeline.py
index bca6dd38c..fb104b8e5 100644
--- a/geos-trame/src/geos/trame/app/ui/timeline.py
+++ b/geos-trame/src/geos/trame/app/ui/timeline.py
@@ -74,16 +74,26 @@ def _updated_tasks(self, *tasks: Any, **_: Any) -> None:
             if not self.tree._search(f'Problem/Events/0/PeriodicEvent/{t["id"]}'):
                 self.tree.input_file.pb_dict['Problem']['Events'][0]['PeriodicEvent'].append( self.tree.encode_data(PeriodicEvent(name="test")) )
 
+            #TODO test if tasks/events added
+            proxy = self.simput_manager.proxymanager.get(f'Problem/Events/0/PeriodicEvent/{t["id"]}')
             self.tree.update(f'Problem/Events/0/PeriodicEvent/{t["id"]}','beginTime', event['begin_time'])
+            proxy.set_property("begin_time",event['begin_time'])
             self.tree.update(f'Problem/Events/0/PeriodicEvent/{t["id"]}','endTime', event['end_time'])
+            proxy.set_property("end_time",event['end_time'])
             self.tree.update(f'Problem/Events/0/PeriodicEvent/{t["id"]}','name', event['name'])
+            proxy.set_property("name",event['name'])
             self.tree.update(f'Problem/Events/0/PeriodicEvent/{t["id"]}','target', self.tree.registered_targets[event['category']])
+            proxy.set_property("target", self.tree.registered_targets[event['category']] )
             
             if "freq" in t and t["freq"] is not None:
                 self.tree.update(f'Problem/Events/0/PeriodicEvent/{t["id"]}','timeFrequency', timedelta(days=int(t["freq"])).total_seconds())
+                proxy.set_property("time_frequency", timedelta(days=int(t["freq"])).total_seconds())
+            
+            proxy.commit()
+            
         
-        rm_list.extend( range(len(self.state.tasks),len(self.tree.input_file.problem.events[0].periodic_event)) )
         #remove lost indexes
+        rm_list.extend( range(len(self.state.tasks),len(self.tree.input_file.problem.events[0].periodic_event)) )
         for i in rm_list:
             self.tree.drop(f'Problem/Events/0/PeriodicEvent/{i}')