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IE toolbar expansion is how to make IE components can be extended to respond incident. In their own procedures used WebBrowser Control friends all know, WebBrowser control such as the definition BeforeNavigate, DownloadComplete incidents, we can handle the matter through the preparation of code to achieve WebBrowser control operation. So how to achieve the right IE incident response and handling? IE with the establishment of the same panel. We need to build an interface to achieve IObjectWithSite COM different is, we also need to implement the IDispatch interface, the interface SetSite IObjectWithSite method was IE WebBrowser interface and establish their own connections with the WebBrowser, then if the IE object pda.en.wapedia.org what happens incident, then IE the pullback would IDispatc