Returns a reference to the unmanaged WebBrowser ActiveX control site, which you can extend to customize the managed WebBrowser control.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
This method is useful if you are familiar with OLE development using the unmanaged WebBrowser ActiveX control and you want to extend the functionality of the Windows Forms WebBrowser control, which is a managed wrapper for the ActiveX control. You can use this extensibility, for example, to customize the browser shortcut menu and shortcut keys or to provide a custom security configuration for hosted documents.
To use this feature, implement classes that inherit from the WebBrowser and WebBrowser.WebBrowserSite classes. The unmanaged WebBrowser ActiveX control uses the protected method to retrieve extensibility interfaces implemented by the WebBrowser.WebBrowserSite class. Override the method to return an instance of your own class that inherits from the WebBrowser.WebBrowserSite class. The WebBrowser.WebBrowserSite class provides default implementations of the OLE IDocHostUIHandler interface. You can provide your own implementation of this interface or implement any other WebBrowser ActiveX control interface in order to customize the behavior of the control.
If you provide your own implementation for any IDocHostUIHandler members, you must implement all the members of that interface.