JClient - How to use multiple interacting JComboBox controls?

Hi there,
I would like to use 2 or more combobox controls that interact with each other, there data is master detail (detail...). When the master is selected the detail gets filtered. Also it would be nice if the master is null that all detail items would be shown and when detail is selected the master would be set accordingly.
For an example think of an address with the combination of country - state - city.
Country
 â€¢ State
  o City
USA
ʉۢNY
  o ALBANY
  o BROOKLYN
  o BUFFALO
  o NEW YORK CITY
  o QUEENS
ʉۢ PA
  o ALLENTOWN
  o PHILADELPHIA
  o PITTSBURGH
ʉۢ NJ
  o ATLANTIC CITY
  o JERSEY CITY
  o TRENTON
  o NEWARK
ʉۢ FL
  o ORLANDO
  o ST. PETERSBURG
  o TAMPA
  o MIAMI
  o DAYTONA BEACH
CANADA
ʉۢ ONTARIO
  o AJAX
  o TORONTO
ʉۢ NOVA SCOTIA
  o HALIFAX
ʉۢ BRITISH COLUMBIA
  o VANCOUVER
  o RICHMOND
When USA is selected in the country combobox, only its states are shown in the state combobox, then when NY is selected in the state combobox only its city's are shown in the city combobox.
If possible as a bonus it would be nice to be able to select any state when country is null and any city when both country and state are null (not selected). And when selected the parent's would be set.
Example if country and state are not selected and MIAMI is selected as the city then state would be set to FL and country to USA automatically. This would be nice to have but not necessary.
Only the filtering part is really needed. When country is first selected and that filters state, followed be selection of state that filters city's.
Thank you in advance
James

Found a previus post about the same topic in UIX
Master-Detail Pulldown-Menu's With PPR
Going to try using Navigation List and see what happens.

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