Index: sources/gui/qml/pages/MainStack.qml
===================================================================
diff -u -r0dfba44fb7172b9458d161b3ed5f54527f93b698 -r4a2b83dcb56555861d2c741a8e8894e5b07e24bf
--- sources/gui/qml/pages/MainStack.qml	(.../MainStack.qml)	(revision 0dfba44fb7172b9458d161b3ed5f54527f93b698)
+++ sources/gui/qml/pages/MainStack.qml	(.../MainStack.qml)	(revision 4a2b83dcb56555861d2c741a8e8894e5b07e24bf)
@@ -41,12 +41,16 @@
 
     property var currentScreen: stackView.currentItem
 
+    signal isCreateRx(bool vState) // pass upstream to HeaderBar
+
     stackView.initialItem   : _root.initialItem
 
     // Standby / Disinfection
     DisinfectStack                  { id: _disinfectStack                   }
     // Pre Treatment
-    PreTreatmentStack               { id: _preTreatmentStack                }
+    PreTreatmentStack               { id: _preTreatmentStack
+        onIsCreateRxChanged     : _root.isCreateRx(_preTreatmentStack.isCreateRx)
+    }
     // In TreatmentStack
     TreatmentStack                  { id: _treatmentStack                   }