Populate elements in DDK

Hi All,
I have a scenario where I'm using 3 Drop down by Keys in a webdynpro Application.
I have created a structure called country and binded it to the context for the 1st DDK.
Depending on the selection of country the next two DDK elements should get populated.
for example if the country is selected as India, the next DDK should represent the states like Andhra pradesh, karnataka..etc and the 3rd DDK should contain cities of their respective states.
I have created the other two structures for state and cities.
Could any one help me and advise me how to proceed on this.
regards
ambicasony

try this.
public void fillMaster( )
 //@@begin fillMaster()
 String data[][] = { {"India", "Kerala", "Trivandrum"},
 {"India", "Kerala", "Kochin"},
 {"India", "Maharashtra", "Mumbai"},
 {"India", "Maharashtra", "Pune"},
 {"USA", "New York", "Albany"},
 {"USA", "Georgia", "Atlanta"},
 {"USA", "Arizona", "Phoenix"},
 {"USA", "Florida", "Tallahassee"},
 {"USA", "Texas", "Austin"}};
 IPublicExp_1.IMasterElement master;
 for( int i = 0; i < data.length; i++){
 master = wdContext.createMasterElement();
 master.setCountry( data[ i][ 0]);
 master.setState( data[ i][ 1]);
 master.setRegion( data[ i][ 2]);
 wdContext.nodeMaster().addElement( master);
 //@@end
Adding Country/ States/ Region
private void addCountry(){
 String country = "";
 IWDAttributeInfo cntinfo = wdContext
 .nodeChild()
 .getNodeInfo()
 .getAttribute( "Country");
 ISimpleTypeModifiable sim = cntinfo.getModifiableSimpleType();
 IModifiableSimpleValueSet valset = sim
 .getSVServices()
 .getModifiableSimpleValueSet();
 valset.clear();
 IPublicExp_1.IMasterNode masternode = wdContext.nodeMaster();
 for( int i = 0; i < masternode.size(); i++){
 country = masternode
 .getMasterElementAt( i)
 .getCountry();
 valset.put( country, country);
 private void addState(){
 String state = "";
 IWDAttributeInfo cntinfo = wdContext
 .nodeChild()
 .getNodeInfo()
 .getAttribute( "State");
 ISimpleTypeModifiable sim = cntinfo.getModifiableSimpleType();
 IModifiableSimpleValueSet valset = sim
 .getSVServices()
 .getModifiableSimpleValueSet();
 valset.clear();
 IPublicExp_1.IMasterNode masternode = wdContext.nodeMaster();
 IPublicExp_1.IMasterElement masterele;
 for( int i = 0; i < masternode.size(); i++){
 masterele = masternode
 .getMasterElementAt( i);
 if( masterele.getCountry().equalsIgnoreCase( wdContext.currentChildElement().getCountry()))
 state = masterele.getState();
 valset.put( state, state);
Call method on action of drop downs
public void fillCountry( )
 //@@begin fillCountry()
 addCountry();
 //@@end
//@@begin javadoc:fillState()
/** Declared method. */
//@@end
public void fillState( )
 //@@begin fillState()
 addState();
 //@@end
vinod v

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