How can I customize the refreshing icon for a Pull to Refresh Listview?

I would like to modify the existing refreshing animation for the Pull to Refresh for a Listview.

I've created a Listview with the following properties:

RefreshCommand="{Binding LoadItemsCommand}"
IsPullToRefreshEnabled="true"
IsRefreshing="{Binding IsRefreshing, Mode=OneWay}"
CachingStrategy="RecycleElement"

And the pull to refresh action works like I want it to, but the animation used is the standard Android and iOS animation. I would like to customize this by adding some text, changing the position of the loading icon and changing the color schemes.

I've achieved the perfect layout by placing a grid over my listview and binding the IsVisible to the same IsRefreshing, but it only shows after the refreshing command has started (which makes sense of course...) and I would like this grid to slide down when starting the pull down, showing while refreshing and dissappearing when the refreshing is done.

Any help is much appreciated!