Rails not dynacially loading new content

Hi, im running instant rails on vista, i've managed to create the "15
min blog" using scaffolding the only thing is that i need to restart
mongrol everytime i create a new controller or make a change to the
source of my application, which is incredibly tedious! How can i make
it so rails automatically detects changes in the code, i know you can,
because the book im reading (agile web development with rails) often
refers to rails ability to detect changes when the script is in
development enviornment.

Im running ruby 1.8.6 and rails 2.0.2

Thanks.