public TimeSpan?ShowDialog(TimeSpan initialValue)
{
dialogUI = new UpdateTimer();
dialogUI.Owner = System.Windows.Application.Current.MainWindow;
var vm = dialogUI.DataContext as ViewModel.UpdateTimerVM;
vm.DialogCompleted += DialogCompleted;
vm.Timer = initialValue;
if (true == dialogUI.ShowDialog())
{
return(vm.Timer);
}
return(null);
}