private async void abb_novoContato_Click(object sender, RoutedEventArgs e)
{
ContaContatoEditContentDialog cc = new ContaContatoEditContentDialog();
cc.SalvaContatoHandler += Cc_SalvaContatoHandler;
await cc.ShowAsync();
}
private async void lv_contatos_ItemClick(object sender, ItemClickEventArgs e)
{
var contaContato = e.ClickedItem as ContaContatoViewModel;
ContaContatoEditContentDialog cc = new ContaContatoEditContentDialog(contaContato, true);
cc.SalvaContatoHandler += Cc_SalvaContatoHandler;
await cc.ShowAsync();
}