Modifying the redirect page of an input behavior

I created a user input behavior for a user registration page. I also added a check new username behavior. It all works well. The problem isn't really a big problem because it all still works. But, it would be nice if I could modify the code that Dreamweaver generates and NOT get the red exclamation error next to the behavior in the behaviors panel. That way I could still click on the behavior and be able to edit it with the dialog box instead of hand coding it.

Here is the deal. In the input behavior, I specified the redirect page. The code written by Dreamweaver is:

MM_editRedirectUrl = "login_confirmation_send.asp"

Problem is, I want to pass a form value in the query string to that redirected page. So, I modified that code to say:

MM_editRedirectUrl = "login_confirmation_send.asp?email=" & Request.Form("email")

When I do that, I get a big red exclaimation next to the check new user behavior which says the input behavior has been deleted. Eventhough, it still works fine.

Is there a way to modify the code without getting the error?