private IHelpService GetHelpService() { if (helpService == null && ServiceProvider != null) { topHelpService = (IHelpService)ServiceProvider.GetService(typeof(IHelpService)); if (topHelpService != null) { IHelpService localHelpService = topHelpService.CreateLocalContext(HelpContextType.ToolWindowSelection); if (localHelpService != null) { helpService = localHelpService; } } } return helpService; }