diff --git a/Hardware/3rdparty/bugui b/Hardware/3rdparty/bugui
index 9a0bded..995dc6e 160000
--- a/Hardware/3rdparty/bugui
+++ b/Hardware/3rdparty/bugui
@@ -1 +1 @@
-Subproject commit 9a0bded62d9632d05fac99988a8c53bb5e42b7a4
+Subproject commit 995dc6e2b40dae91b0782dba7f9ce712fec10b53
diff --git a/Hardware/Widgets/EventWidget.cpp b/Hardware/Widgets/EventWidget.cpp
index 4e5bee0..16303e5 100644
--- a/Hardware/Widgets/EventWidget.cpp
+++ b/Hardware/Widgets/EventWidget.cpp
@@ -80,8 +80,7 @@ void EventWidget::on_state_added(Scenario::StateModel& state)
 
 void EventWidget::on_state_removed(const Scenario::StateModel& state)
 {
-  if (state.eventId() != model.id())
-    return;
+  if (state.eventId() != model.id()) return;
 
   remove_widget([&state]
                 (const auto& w)
diff --git a/Hardware/Widgets/EventWidget.hpp b/Hardware/Widgets/EventWidget.hpp
index b0c9902..eea91a3 100644
--- a/Hardware/Widgets/EventWidget.hpp
+++ b/Hardware/Widgets/EventWidget.hpp
@@ -5,7 +5,8 @@
 
 namespace Hardware
 {
-struct EventWidget final : ScenarioComponentSpec<Scenario::EventModel,
+struct EventWidget final : Nano::Observer
+                         , ScenarioComponentSpec<Scenario::EventModel,
                                                  bugui::container_widget>
 {
   explicit EventWidget(Scenario::EventModel& event,
diff --git a/Hardware/Widgets/ScenarioComponent.hpp b/Hardware/Widgets/ScenarioComponent.hpp
index 1fdca86..c97e99f 100644
--- a/Hardware/Widgets/ScenarioComponent.hpp
+++ b/Hardware/Widgets/ScenarioComponent.hpp
@@ -32,7 +32,7 @@ protected:
       , skin{Process::Style::instance()}
   { }
 
-  ScenarioWidget* scenario;
+  ScenarioWidget* scenario{nullptr};
   const Process::Style& skin;
 };
 
diff --git a/Hardware/Widgets/ScenarioWidget.hpp b/Hardware/Widgets/ScenarioWidget.hpp
index bf7eab7..59a670e 100644
--- a/Hardware/Widgets/ScenarioWidget.hpp
+++ b/Hardware/Widgets/ScenarioWidget.hpp
@@ -11,6 +11,7 @@ namespace Hardware
 class ScenarioWidget final
     : public bugui::container_widget
     , public QObject
+    , public Nano::Observer
 {
   W_OBJECT(ScenarioWidget)
 
@@ -33,7 +34,7 @@ private:
   void on_time_sync_added(Scenario::TimeSyncModel& timeSync);
   void on_time_sync_removed(const Scenario::TimeSyncModel& timeSync);
 
-  Scenario::ProcessModel* model;
+  Scenario::ProcessModel* model{nullptr};
 };
 
 } // namespace Hardware
diff --git a/Hardware/Widgets/TimeSyncWidget.cpp b/Hardware/Widgets/TimeSyncWidget.cpp
index c82fded..e82bf9f 100644
--- a/Hardware/Widgets/TimeSyncWidget.cpp
+++ b/Hardware/Widgets/TimeSyncWidget.cpp
@@ -79,8 +79,7 @@ void TimeSyncWidget::on_event_added(Scenario::EventModel& event)
 
 void TimeSyncWidget::on_event_removed(const Scenario::EventModel& event)
 {
-  if (event.timeSync() != model.id())
-    return;
+  if (event.timeSync() != model.id()) return;
 
   remove_widget([&event]
                 (const auto& w)
diff --git a/Hardware/Widgets/TimeSyncWidget.hpp b/Hardware/Widgets/TimeSyncWidget.hpp
index 6d92bba..fb69a89 100644
--- a/Hardware/Widgets/TimeSyncWidget.hpp
+++ b/Hardware/Widgets/TimeSyncWidget.hpp
@@ -6,7 +6,8 @@
 
 namespace Hardware
 {
-struct TimeSyncWidget final : ScenarioComponentSpec<Scenario::TimeSyncModel,
+struct TimeSyncWidget final : Nano::Observer
+                            , ScenarioComponentSpec<Scenario::TimeSyncModel,
                                                     bugui::container_widget>
 {
   explicit TimeSyncWidget(Scenario::TimeSyncModel& timeSync,