title: Setting context property for multiple qml files
body: <p>I have a main.qml and inside that i have two banners(titlebanner and bottombanner) as shown in below.</p>
  
  <pre><code>Window {
      id: main
      visible: true
  
      Image {
          source: "qrc:/banner.png"
          anchors.fill: parent
      }
  
      TitleBanner {
          x:0
          y:10
      }
  
      BottomBanner {
          x:0
          y:420
      }
  }
  </code></pre>
  
  <p>In TitleBanner.qml, i have below code</p>
  
  <pre><code>Item {
      Rectangle {
          id : id_title_banner
  
          property real value : titlebanner.title
  
          Image {
              source: "qrc:/banner_title.png";
          }
  
          //todo:: some animation stuffs on 'value' later
      }
  }
  </code></pre>
  
  <p>In BottomBanner.qml, i have below code</p>
  
  <pre><code>Item {
      Rectangle {
          id : id_bottom_banner
  
          property real value : bottombanner.title
  
          Image {
              source: "qrc:/banner_bottom.png";
          }
  
          //todo:: some animation stuffs on 'value' later
      }
  }
  </code></pre>
  
  <p>In C++ side, I am keeping two separate objects(for later flexibility) for both title banner and bottom banner. I set the root context property to expose the title banner objects from C++ to qml as below</p>
  
  <pre><code>int main(int argc, char *argv[])
  {
      QGuiApplication app(argc, argv);
  
     //create title banner object
     CTitleBanner *objTitleBanner = new CTitleBanner();
  
     //create bottom banner object
     CBottomBanner *objBottomBanner = new CBottomBanner();
  
     QQmlApplicationEngine engine;
     engine.rootContext()-&gt;setContextProperty("titlebanner", objTitleBanner);
  
     engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
  
     return app.exec();
  </code></pre>
  
  <p>}</p>
  
  <p>My question is, how can we set context property for both titlebanner and bottombanner qml files separately instead of setting it to root context ? My concern is at later point if more banner comes, I set it to rootContext. Is it a proper way of doing ? How can we create seperate context for each banner ?</p>