internal void OnScrolling(object sender, EventArgs args)
{
//Listener.CancelActiveGestures(); // this breaks UWP listview scrolling!!!
//System.Diagnostics.Debug.WriteLine("scrolling");
IsScrolling = true;
Scrolling?.Invoke(this, args);
//System.Diagnostics.Debug.WriteLine("EnhancedListView.OnScrolling: offset=[" + ScrollOffset + "]");
}