date drop down menu

[Danna Dowdy]

I am working on a basic mapping application that currently displays data 
from a spatial database based on variable groupings.  I have individual 
views set up for each individual layer and have the grouping set up in 
the legend template.  I would like to add a drop down menu somewhere on 
the interface so that the user could select a year and plot whatever 
layers are chosen for that particular year.  Could someone point me in 
the right direction of how to do this?