how to select values from popup window in ruby scripting

I am testing my application using Watir.Application contains popup window where i have to select the value and set that value to some field in parent window .can any one suggest ho开发者_开发知识库w to write ruby script to select value from popup window and set to field in parent window.

This could help: http://wiki.openqa.org/display/WTR/Pop+Ups