public object ViewModel(Func<object> constructor)
{
if (DesignMode)
return constructor();
string caller = new StackFrame(1).GetMethod().Name;
if (!caller.StartsWith("get_"))
throw new ArgumentException("Only call ViewModel from a property getter.");
string propertyName = caller.Substring(4);
ForView.Initialize();
ViewModelContainer container;
if (!_containerByName.TryGetValue(propertyName, out container))
{
container = new ViewModelContainer(() => FirePropertyChanged(propertyName), constructor);
_containerByName.Add(propertyName, container);
}
return container.ViewModel;
}