How to get a bb:cascades:Control object size?

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  I need to return the value of the property QML in C++ code, problem is that this value is object of bb::cascades:Control

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  import bb.cascades 1.2
  
  Page {
   property NavigationPane currentNavigationPane: tab1.navHandle
   property int testprop:0
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  I found the solution by Exhibitor class c ++ in QML and I can call its methods with pointer to bb::cascades:Control as a parameter
  QML
  Page {
  id:this_page
      onCreationCompleted: {
          mainCPP.UpdatePage(this_page);
      }
  }
  
  C++
  Q_INVOKABLE void UpdatePage(bb::cascades::Page *call_back_page){
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  qDebug()<<"Page is valid";
  }
  }
  
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