C# webbrowser loading complete event on tab based website
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I am trying to control a database webclient(IBM ClearQuest Webclient) using c# webBrowser to do same automation operations. My program will input the query id and click the submit button on the website. And the website will create a new tab to show the query details. 

I need to know when the new tab is loaded completely. But I tried .DocumentCompleted event and .ProgressChanged event, but seems like they are not triggered after the new tab is loaded completely. 

Which event should I use? Thanks.