procedure TForm1.Button1Click(Sender: TObject);
var
eQuery: OLECMDF;
vaIn, vaOut: OleVariant;
begin
try
eQuery := Webbrowser1.QueryStatusWB(OLECMDID_PROPERTIES);
if (eQuery and OLECMDF_ENABLED) = OLECMDF_ENABLED then
Webbrowser1.ExecWB(OLECMDID_PROPERTIES, OLECMDEXECOPT_PROMPTUSER, vaIn, vaOut);
except
end;
end;