protected override void OnAppearing()
{
MessagingCenter.Subscribe <BaseViewModel, string>(this, Constants.ShowInfo, async(view, param) => await StatusBand.ShowInfo(param));
MessagingCenter.Subscribe <BaseViewModel, string>(this, Constants.ShowWarning, async(view, param) => await StatusBand.ShowWarning(param));
MessagingCenter.Subscribe <BaseViewModel, string>(this, Constants.ShowError, async(view, param) => await StatusBand.ShowError(param));
MessagingCenter.Subscribe <BaseViewModel>(this, Constants.Hide, view => StatusBand.Hide());
MessagingCenter.Subscribe <BaseViewModel>(this, Constants.NavigateNext, view => ViewModel.NextCommand.Execute(null));
MessagingCenter.Subscribe <BaseViewModel>(this, Constants.NavigateNextForced, view => ViewModel.NextForcedCommand.Execute(null));
MessagingCenter.Subscribe <BaseViewModel>(this, Constants.NavigateTo, view => ViewModel.NavigateToCommand.Execute(null));
ViewModel.LoadCommand.Execute(null);
base.OnAppearing();
}