title: Combobox with images
body: <p>Is it possible to create the <code>ComboBox</code> with images instead of strings? It doesn't support <code>delegate</code>:</p>
  
  <pre><code>ComboBox {
          currentIndex: 2
          model: ListModel {
              id: cbItems
              ListElement { imageHeight: 280; imageSource: "../images/tee3.png"  }
              ListElement { imageHeight: 300; imageSource: "../images/tee5.png"  }
              ListElement { imageHeight: 218; imageSource: "../images/tee1.png"  }
          }
          delegate: Image {
              height: imageHeight
              fillMode: Image.PreserveAspectFit
              source: imageSource
          }
          width: 200
      }
  </code></pre>