I would like to load a Map component in background with a Loader only when the visible Map property is true. Moreover, I need to access the Map center property. How can create a property alias to the Map center property when the Map is loaded with a Loader?

Map2.qml:
Qt Code: 
  1. import QtQuick 2.0
  2. import QtQuick.Controls 1.3
  3. import QtLocation 5.5
  4. import QtPositioning 5.3
  5.  
  6. Item {
  7.     id: root
  8.  
  9.     property alias center: ?????
  10.  
  11.     Loader {
  12.         anchors.fill: parent
  13.         id: mapLoader
  14.         active: root.visible
  15.         sourceComponent: cMap
  16.     }
  17.     Component {
  18.         id: cMap
  19.         Item {
  20.             anchors.fill: parent
  21.             Slider {
  22.                 id: zoomSlider;
  23.                 z: map.z + 3
  24.                 minimumValue: map.minimumZoomLevel;
  25.                 maximumValue: map.maximumZoomLevel;
  26.                 anchors.margins: 10
  27.                 anchors.bottom: parent.bottom
  28.                 anchors.top: parent.top
  29.                 anchors.right: parent.right
  30.                 orientation : Qt.Vertical
  31.                 value: map.zoomLevel
  32.                 onValueChanged: {
  33.                     map.zoomLevel = value
  34.                 }
  35.             }
  36.             Map {
  37.                 id: map
  38.                 anchors.fill: parent
  39.                 plugin: osmPlugin
  40.                 zoomLevel: 7
  41.             }
  42.             Plugin {
  43.                 id: osmPlugin
  44.                 name: "osm"
  45.             }
  46.  
  47.         }
  48.     }
  49. }
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Using on another qml:
...
Qt Code: 
  1. Map2 {
  2.      visible: cbMap.checked
  3.      center: QtPositioning.coordinate(1.759767, 1.864124)
  4. }
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