Dynamically populating data for the drop down lists

Hi,
I am trying to have a mutually dependent drop down lists in my page.
This is what I am trying to do -
Lets consider there are 3 drop down lists (Choice - Select Many). A simple example lists are - Country, State, County. Now users selects country from drop down, I need to get all the states for that country as the data for the "State" drop down list. Then user selects a state, I need to populate data for the "County" drop down list.
I am trying to do this. I added a ValueChangeListener method in the backing bean and tried to add this on the "Select Many Choice" component. But the method is never fired. I tried to change few other properties like - "immediate", "Auto Submit". but method is not fired.The method in backing bean is as shown below -
public void onRegionSelect(ValueChangeEvent event) {
System.out.println("Value changed ==>> "+event.getNewValue().toString());
Need some help on how to do this.
JDev: Version 11.1.2.3
Thanks.

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Dynamically populating data for the drop down lists

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