//Update the list view of the dictionary after an item has been added or removed
public void UpdateItemsOnListaPreviaDeNumeros()
{
VistaPrevia.ItemsSource = Jugada_Puntos;
VistaPrevia.Items.Refresh();
VistaPrevia.SelectedIndex = VistaPrevia.Items.Count - 1;
VistaPrevia.ScrollIntoView(VistaPrevia.SelectedItem);
int itemsTotal = Jugada_Puntos.Sum(v => v.Value);
string price = (itemsTotal.ToString() + ".00 € ");
totalSum.Text = price;
}