public async void RefreshList()
{
IsRefreshing = true;
HockeyApp.MetricsManager.TrackEvent("Transaction List Refreshed");
await _azure.UpdateAllTransactions(_auth.CurrentUser, CurrentCard.CardID);
var ret = await _azure.GetAllTransactions(CurrentCard.CardID);
TransactionsList = null;
TransactionsList = new ObservableCollection <Transaction>(ret);
IsRefreshing = false;
}