I don't know if this is what you mean, but you can do the following:

1) Create a Popuwindow set the Opacity to "0" and do not hide it initially

2) Put a text area in it and set the opacity to what you want to hide the background then set the action to the linked scene

Hello Don,

Jeez mate, this is a step back in time.

This product hasn't been on the market in years.

Anyway, there is a code example of what you are asking on my website

www.omnipix.net/knowledge/java/dropdown

All the best, Smooth