Here's how I solved it:
WbAws.LoadingFrameCompleted += OnLoadingFrameCompleted;
WbAws.Source = new Uri("http://google.com");
private void OnLoadingFrameCompleted(...)
{
if (webView == null || !webView.IsLive ||
webView.ParentView != null || !e.IsMainFrame)
return;
LoadingFrameCompleted -= OnLoadingFrameCompleted;
}
LoadingFrameCompleted DocumentReady , , , , . , IsMainFrame.
: , . , Thread.Sleep.