public async void LoadCoins()
{
var coins = await _icoins.GetCoinsList();
GroupCoins(coins);
IsBusy = false;
foreach (var coin in coins)
{
coinsModel.Add(coin);
}
coinsModelList = new List <CoinsModel>(coinsModel);
if (Device.OS != TargetPlatform.WinPhone)
{
groupHeader = new DataTemplate(typeof(HeaderCell));
}
}
