public WindowBottomBarPartViewModel( IVersionService versionService, IEventService eventService, IViewModelSource viewModelLocator) { _eventService = eventService; // build view models for child user controls UpdateControlViewModel = viewModelLocator.GetExisting <UpdateControlViewModel>(); GameControlViewModel = viewModelLocator.GetExisting <GameControlViewModel>(); EventsButtonControlViewModel = viewModelLocator.GetExisting <EventsButtonViewModel>(); // setup vars VersionString = versionService.GetLauncherVersion().ToString(); }