Native WlanAPI: how to ignore the profile mismatch?

I am developing a utility to manage the wireless connection. I found that
Vista will prevent user to connect to an AP with a mismatch profile, e.g. if
user create a profile with OPEN+WEP and want to use this profile to connect
to a WPA AP, the 'connect' button will be disabled.

So does my utility. When my application made a OPEN+WEP profile and use
WlanConnect() to connect to the WPA AP, there is no authentication and
association request packet being sent out.

Is there anyway to avoid this limitation?

Any comment is appreaciated.