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;
}