Change background color on a Drop down list based on the value

Hello,

I'm new on the LiveCycle designer and I need a little help.

I try to make a drop-down list with 3 options (lets say January, Februray and March). When I'll chose one of this options I want the background to change automatically (lets say for January in yellow, for February in red and for March in blue).

Your help will be much appreciated,

Adrian