Index: sources/gui/qml/PowerItem.qml
===================================================================
diff -u -r981e534e5b3174aab7ec47de3b1ead1511dbb6ef -r787e08545efa12ddc8383de8b973ab9762de0853
--- sources/gui/qml/PowerItem.qml	(.../PowerItem.qml)	(revision 981e534e5b3174aab7ec47de3b1ead1511dbb6ef)
+++ sources/gui/qml/PowerItem.qml	(.../PowerItem.qml)	(revision 787e08545efa12ddc8383de8b973ab9762de0853)
@@ -81,6 +81,11 @@
         _alarmItem.alarmMaximize()
     }
 
+    function cancel() {
+        _powerOffDialog.close()
+        if ( vConfirm.needConfirm ) vConfirm.doConfirm( false )
+    }
+
     function reject() { // the power off is the only confirm has separate reject dialog, because the button is not only on UI and is HW as well.
         _autoHideInfo.showDialog(
                     qsTr("Cannot shutdown during 'Treatment'"), // '%1').arg()