Index: sources/gui/qml/pages/pretreatment/PreTreatmentStack.qml
===================================================================
diff -u -r41ba9331e6a540df0c8eced0c4d3b8684afa9afa -r04fd28f30e37a09450ff5877ae2f805a92898b44
--- sources/gui/qml/pages/pretreatment/PreTreatmentStack.qml	(.../PreTreatmentStack.qml)	(revision 41ba9331e6a540df0c8eced0c4d3b8684afa9afa)
+++ sources/gui/qml/pages/pretreatment/PreTreatmentStack.qml	(.../PreTreatmentStack.qml)	(revision 04fd28f30e37a09450ff5877ae2f805a92898b44)
@@ -148,9 +148,13 @@
 //    PreTreatmentConsumablesStack{ id: _preTreatmentConsumablesStack     ;objectName: "_preTreatmentConsumablesStack" }
 //    PreTreatmentPrimeStack      { id: _pretreatmentPrimeStack           ;objectName: "_pretreatmentPrimeStack"       }
 //    PreTreatmentConnectionStack { id: _pretreatmentConnectionStack      ;objectName: "_pretreatmentConnectionStack " }
-    PreTreatmentInstallation    { id:   _pretreatmentInstallation   }
-    PreTreatmentCreate          { id:   _pretreatmentCreate         }
+    PreTreatmentBase    { id:   _pretreatmentInstallation
+        instructionBased    : true
+        onVisibleChanged    :  if (visible) { stackStepIndex = PreTreatmentStack.Installation }
+    }
 
+    PreTreatmentCreate  { id:   _pretreatmentCreate         }
+
     Connections { target: vPreTreatmentAdjustmentDisposablesConfirm
         function onAdjustmentTriggered              ( vValue ) {
             if ( vPreTreatmentAdjustmentDisposablesConfirm.adjustment_Accepted ) {