While implementing AfterCommandExecuted browser event handler there is a difference between sender and EventsArgs : private void ActiveBrowser_AfterCommandExecuted(object sender, ArtOfTest.WebAii.EventsArgs.BrowserCommandEventArgs e) { var browser = (Browser)sender; //This returns true when there are frames in the browser if (e.Command.HasFrames) { //This returns the frameInfo in String form for all frames in current browser. Manager.Log.WriteLine("FrameInfo :" + e.Command.FramesInfo); //At the same time the 'normal' browser returns a frameCount of zero Manager.Log.WriteLine("FrameCount from browser:" + browser.Frames.Count); } } e.Command.HasFrames returns true while browser.FramesCount returns 0 Steps to reproduce: Download the attached project and run it. The implementation of the event handler is in the very first step.