a wms layer in a dhtml rubber-band box itasca demo.

[toni hernández]

I am trying to understand how the dhmlt rubber-band box is working.
The thing is I'd like to insert a wms layer in the map file.

The map file is working fine, but when I use the rubber-band box 
functions the screen just turn red and no image (not even an error) is 
diplayed.
Does anyone know what's happening?
how can I insert a wms layer?
thanks