Setting SelectedItem from ViewModel

The first time the View is loaded, the item in the ListView is not selected in UI (although it is selected in the ViewModel), but if I refresh, the item is selected in UI view. I am having this problem only in Android, in iOS is working fine.

XAML code:

  <ListView ItemsSource="{Binding SalesPersons}"
            SelectedItem="{Binding SelectedSalesPerson, Mode=TwoWay}" IsPullToRefreshEnabled="True"
            RefreshCommand="{Binding UpdateSalesPersonsCommand}" IsRefreshing="{Binding IsLoadingList}">
    <ListView.ItemTemplate>
      <DataTemplate>
        <TextCell TextColor="{StaticResource DarkColor}" Text="{Binding Name}"/>
      </DataTemplate>
    </ListView.ItemTemplate>
  </ListView>

ViewModel code:

    public SalesPerson SelectedSalesPerson
    {
        get
        {
            return _selectedSalesPerson;
        }
        set
        {
            _selectedSalesPerson = value;
            base.OnPropertyChanged("SelectedSalesPerson");
        }
    }

This possible bug is happening only in Android when I set the ItemsSource field the first time. If I refresh it works. Howecer, in iOS is working fine always.

Somebody know something about this?