title: Xamarin forms listview without caching strategy after refreshing the list showing empty cells at the top
body: <p>I have a project in Xamarin.Forms which contains a listView bound to a List.</p>
  
  <p>The listView contains cells, each with a label and an image. I have one toolbar item: refresh. the refresh updates the list with the new items.  </p>
  
  <p>I am not using CachingStrategy.</p>
  
  <p>The interesting part is: refresh toolbar item, the upper part of the listView (which is visible on-screen) is not refresh BUT when I scroll down the listView, the newly generated cells and old cells are visible. </p>
  
  <p>How can I refresh the list without displaying empty cells?</p>