xml remote datasource

Hi,

I am new to Visual Builder and trying to configure an xml datasource. I am running a different webapp in another port in my localhost and trying to access the xml response that requires basic auth.
I tried supplying the username and password in the url itself
http://username:passowrd@localhost:8090/. But Visual Builder came up with a 401 response.

Please let me know how to configure basic auth info from visual builder.
I am using SmartClient v9.1.

thanks,
svidya