Displaying list upon certain selection

Hi,

I have a large number of lists. I'm trying to figure out a way to display a previously invisible list when a user selects a certain topic on a list. For example, I have these lists:

List OMEGAEPList =new List(5,false);

OMEGAEPList.add("Opto-Mechanical Systems");

OMEGAEPList.add("Diagnostics");

OMEGAEPList.add("System Engineering");

container.add(OMEGAEPList);

List OptMechSysList =new List(5,false);

OptMechSysList.add("SPPOL");

OptMechSysList.add("TAS");

container.add(OptMechSysList);

What I want is for OptMechSysList to be displayed if the user clicks "Opto-Mechanical Systems". I've read through many APIs, and have tried out Listeners, but I can never seem to get them to work. Can someone please give me advice?

Thanks,

Dan

[1084 byte] By [Djaunla] at [2007-10-3 2:57:51]