Simple HTML editing control in winform-problem records in winhtmlcontrol win7

Winhtmlcontrol is found in the blog Park, address: http://www.cnblogs.com/wuhuacong/archive/2009/07/07/1518346.html

Run in WINXP and 2003 no problem, but put below win7 run will be unable to get the input focus of the problem, found the source of this control on codeproject (his guess, attached address: http://www.codeproject.com/Articles/15559/A-Windows-Forms-based-text-editor-with-HTML-output)

The specific solution is found in the reply:

Private void webbrowserappsdocumentcompleted (Object sender, webbrowserdocumentcompletedeventargs E)
{
If (webbrowser1.version. Major> = 9)
{
Webbrowser1.document. Write (webbrowser1.documenttext );
Doc. designMode = "on ";
}
}

In general, it is a special process for ie9 under win7. Please tell me why you know something about it.