Index: sources/gui/qml/pages/treatment/TreatmentSectionHeader.qml
===================================================================
diff -u -rec9c06478bddf4cadf546aa4a49bb18b224f3b50 -r6c3a4b048006ebd90c85cfa943d2b9615dc808f3
--- sources/gui/qml/pages/treatment/TreatmentSectionHeader.qml	(.../TreatmentSectionHeader.qml)	(revision ec9c06478bddf4cadf546aa4a49bb18b224f3b50)
+++ sources/gui/qml/pages/treatment/TreatmentSectionHeader.qml	(.../TreatmentSectionHeader.qml)	(revision 6c3a4b048006ebd90c85cfa943d2b9615dc808f3)
@@ -24,11 +24,14 @@
     property bool editEnabled   : true
     property bool showLock      : false
     property bool showEdit      : true
+    property bool showExpanding : false
+
     property int titleLeftMargin: Variables.defaultMargin * 2
     property bool setEditActive : true // set to disable edit no matter what
 
-    signal editClicked
-    signal lockClicked
+    signal editClicked()
+    signal lockClicked()
+    signal expandingClicked()
 
     color       : Colors.treatmentSectionHeader
     height      : Variables.contentHeight + (Variables.defaultMargin * 2)
@@ -58,6 +61,20 @@
         color: Colors.textTextRectLabel
     }
 
+    ArrowButton {id : _expandingArrows
+        objectName      : "expandingArrows"
+
+        anchors {
+            verticalCenter  : _title.verticalCenter
+            right           : _editButton.left
+            rightMargin     : Variables.defaultMargin * 2
+        }
+        iconSize        : Variables.iconButtonSize
+        visible         : showExpanding
+        expandingArrow  : true
+        onClicked       : _root.expandingClicked()
+    }
+
     IconButton { id  : _lockButton
         anchors {
             verticalCenter  : _title.verticalCenter