public Command ShowCommand
{
    get
    {
       return new Command(() =>
       {
            var viewModel = new CalcViewModel();
            var dependencyResolve = this.GetDependencyResolver();
            var uiVisualizerService = dependencyResolve.Resolve<UIVisualizerService>();
            uiVisualizerService.ShowDialog(viewModel);
        });
    }
}