public async void HandleConfirmation(BuySellViewModel sender) { if (vm.SelectedCrypto.PriceUsd != null) { var config = new ConfirmConfig() { Title = "Revendre?", Message = "Voulez vous revendre du " + vm.SelectedCrypto.Name + "qui vaut " + vm.SelectedCrypto.PriceUsd + "$ ?", OkText = "Oui", CancelText = "Non", }; if (await UserDialogs.Instance.ConfirmAsync(config)) { vm.DoSomething(); vm.RefreshData(); } } }