Sorry for the late reply...
I intended to add some more features to the DLL, but I had some stuff happening in my life that strayed me away from the Forum, and computers overall...
Still, if you have the name of the dropdown element/control, you can use the getdocument method, fetch the element, add the necessary html code and re-feed it to the WebBrowserEx.
I konw this is possible because I managed to auto-Post a form by adding html to the original page, so any other html elemente can be managed/changed if you know html.