Index: sources/gui/qml/components/RangeBar.qml
===================================================================
diff -u -r56e378f7504701b9e9a9dccaf205aef2fd52c58e -race4047d1007962c136fa32d0531102e22073f32
--- sources/gui/qml/components/RangeBar.qml	(.../RangeBar.qml)	(revision 56e378f7504701b9e9a9dccaf205aef2fd52c58e)
+++ sources/gui/qml/components/RangeBar.qml	(.../RangeBar.qml)	(revision ace4047d1007962c136fa32d0531102e22073f32)
@@ -35,13 +35,15 @@
     property int    markerHeight: Variables.rangeMarkerHeightMidle
     property color  markerColor : Colors.rangeMarker
 
+    property bool   markerVisible       : true
     property int    markerBoundHeight   : Variables.rangeMarkerHeightShort
     property color  markerBoundColor    : Colors.rangeMarkerShort
 
     property bool   minTextHorizontalCenter: true
     property bool   maxTextHorizontalCenter: true
 
     RangeRect { id: _rangeRect
+        color:  "red"
         x       : ((parent.width * (lowerBound - parent.minimum)) / (parent.maximum - parent.minimum))
         height  : parent.height
         width   : ((parent.width * (upperBound - lowerBound)) / (parent.maximum - parent.minimum))
@@ -74,6 +76,7 @@
     }
 
     RangeMarker { id: _rangeMarkerValue
+        visible: _root.markerVisible
         decimal: _root.decimal
         value   : parent.value
         x       : ((parent.width * (parent.value - minimum)) / (maximum - minimum))