Index: sources/gui/qml/pages/MainStack.qml
===================================================================
diff -u -r204d5f7514be78430a667297ced829bd104880d5 -rf83c14046290cebcd5c9229e76f747e4af586698
--- sources/gui/qml/pages/MainStack.qml	(.../MainStack.qml)	(revision 204d5f7514be78430a667297ced829bd104880d5)
+++ sources/gui/qml/pages/MainStack.qml	(.../MainStack.qml)	(revision f83c14046290cebcd5c9229e76f747e4af586698)
@@ -134,13 +134,12 @@
         }
 
         function onHomeChanged                  ( vValue ) { page( _startupScreen                   , vValue    )}
-        function onStandbyChanged               ( vValue ) { /* It depends on the subModes of the standBy. Handled by onHome.  */   }
+        function onStandbyChanged               ( vValue ) { if ( vTDOpMode.standby ) _preTreatmentCreateStack.clear(vValue)         }
         function onStandbyStartChanged          ( vValue ) { /* It depends on the subModes of the standBy. Handled by onHome.  */   }
         function onStandbyWaitTreatmentChanged  ( vValue ) { if ( vValue ) vDisinfectAdjustDisinfect.hasCancel  = false             }
         function onStandbyWaitDisinfectChanged  ( vValue ) { page( _disinfectStack                  , vValue    )}
 
-        function onValidateParametersChanged    ( vValue ) {       _preTreatmentCreateStack.clear   ( vValue    ) // vValue == true if enterig the state ( clear only on entering).
-                                                             page( _preTreatmentCreateStack         , vValue    )}
+        function onValidateParametersChanged    ( vValue ) { page( _preTreatmentCreateStack         , vValue    )}
         function onPreTreatmentChanged          ( vValue ) { page( _preTreatmentStack               , vValue    )}
         function onInTreatmentChanged           ( vValue ) { page( _treatmentStack                  , vValue    )}
         function onPostTreatmentChanged         ( vValue ) { page( _postTreatmentStack              , vValue    )}