How to customize dialog box in user interface (deployment / vs.net / setup project / installer) ?

hi all

I'm trying to build an installer for deploying a ASP .NET web application by
vs .net.

I want to let the use configure his own SQL database
(connection methods, login id and password ...etc.) during the installtion.

but there is no proper interface for this function in setup project's "user
interface dialog boxes".

Now I can override intall method to execute a window application during
intallation,
but that's not what I want.

Is there any way to customize a dialog box in setup project user interface?
thx.

Regards,
Benjamin