ListView.ScrollTo with Custom Cells

Hi

I got a List View with Custom Cells. Looks like this.

<local:BasePage xmlns="http://xamarin.com/schemas/2014/forms"
        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:mr="clr-namespace:MR.Gestures;assembly=MR.Gestures"
                xmlns:cell="clr-namespace:pnyxnetmobile.Views.Cells"
                xmlns:local="clr-namespace:pnyxnetmobile.Views"
        x:Class="pnyxnetmobile.Views.Pages.AllCommentsTabbedPage"
                x:Name="AllCommentsPage"
                BackgroundColor="{StaticResource White}">
    <mr:ListView   x:Name="CommentsListview"
            Style="{StaticResource Timeline}"
            Swiped="ListView_Swiped"
            ItemSelected="CommentsListview_ItemSelected"
            ItemsSource="{Binding Model.PnyxoniumListSorted}"
            SelectedItem="{Binding Model.SelectedGroup, Mode=TwoWay}"
            RefreshCommand="{Binding RefreshAllCommand}"
            IsRefreshing="{Binding Model.IsRefreshingAll}">
        <ListView.GroupHeaderTemplate>
            <DataTemplate>
                <cell:PnyxoniumCell Pnyxonium="{Binding Key}"
                              CellOnClickCommand="{Binding Source={x:Reference AllCommentsPage}, Path=BindingContext.CellOnClickCommand}"
                              SendReplyCommand="{Binding Source={x:Reference AllCommentsPage}, Path=BindingContext.SendReplyCommand}"
                              LikeCommand="{Binding Source={x:Reference AllCommentsPage}, Path=BindingContext.LikeCommand}"/>
            </DataTemplate>
        </ListView.GroupHeaderTemplate>
        <ListView.ItemTemplate>
            <DataTemplate>
                <cell:RefPnyxoniumCell Pnyxonium="{Binding .}"
                            SelectedPnyxonium="{Binding Source={x:Reference AllCommentsPage}, Path=BindingContext.Model.SelectedPnyxonium}"
                            CellOnClickCommand="{Binding Source={x:Reference AllCommentsPage}, Path=BindingContext.CellOnClickCommand}"
                            SendReplyCommand="{Binding Source={x:Reference AllCommentsPage}, Path=BindingContext.SendReplyCommand}"
                            LikeCommand="{Binding Source={x:Reference AllCommentsPage}, Path=BindingContext.LikeCommand}"/>
            </DataTemplate>
        </ListView.ItemTemplate>
    </mr:ListView>
</local:BasePage>

I want to add a scrollTo function where i scroll the selected, tapped item to the top of the screen.

I tried it this way:

    private void CommentsListview_ItemSelected(object sender, SelectedItemChangedEventArgs e)
    {
        CommentsListview.ScrollTo(e.SelectedItem, ScrollToPosition.Start, true);
    }

Since I got this working before when I used Xamarin.Forms Cells I wonder why its not workign anymore.

The ListView.SelectedItem is never assigned as well.