Help with jCombox in NetBeans Module

Hi there,
I am trying to develop a NetBeans Plugin module that allows for 
selection. I used the netbeans module suite project. In this module a 
design a class that declare and initialize all the variable and data 
that I want to use with string variables. In another which is a swing I 
called one of the classes in the first combobox and it was working fine. 
The problem is that I want to fill the second combobox with different 
data from the previous class if each of the items in the first combobox 
is selected. I used switch ....case but, the combobox is only filled 
with the same data even when different items are selected. I have done 
possible things and I have tried to look at any modules tutorial that 
implement netbeans but I did not get any one and I could not get the 
result. please can anybody help. It is urgent. This is the code for the 
first class
public class EmuAPI {
    private String[] device = new String[]{"Pagers", "PDA", "Phones"};
  private String[] deviceType = {"Alcatel", "BenQ - Siemens", "LG", 
"Motorola", "Nokia",};
  private String[] deviceModALcatel = {"OT - C551","OT - C555", "OT - 
C750", "OT - S850","OT - S853" };
  private String[] deviceModBenQ = {"BenQ-Siemens C81", "BenQ-Siemens 
CL71", "BenQ-Siemens CL75", "BenQ-Siemens Q-fi EF51", "BenQ-Siemens S68" };

  private String[] deviceModLG = {"LG KG800 Chocolate", "LG P7200", "LG 
U300", "LG U400", "LG U8330"};
  //private String[] deviceModMitsubishi = {};
  private String[] deviceModMotorola = {"Motorola A780", "Motorola 
E1070", "Motorola RAZR V3i", "Motorola ROKR E2", "Motorola V980"};


  private String[] deviceModeNokia = {"Nokia 6020", "Nokia 6060", "Nokia 
N73", "Nokia N93", "Nokia N9300i"};


  /** Creates a new instance of EmulatorAPI */
  public EmuAPI() {
  }
  public String[] getDevice()
  {
            return device;
  }
    public String[] getDeviceType()
  {
      return deviceType;
  }
    public String[] getdeviceModALcatel()
  {
      return deviceModALcatel;
  }
    public String[] getdeviceModBenQ()
  {
      return deviceModBenQ;
  }
    public String[] getdeviceModLG()
  {
      return deviceModLG;
  }
    public String[] getdeviceModMotorola()
  {
      return deviceModMotorola;
  }
    public String[] getdeviceModeNokia()
  {
      return deviceModeNokia;
  }

}


The is the code that I am using for the first jCombobox and its is 
working fine

public class EmuSelect extends TopComponent implements ActionListener {
  EmuAPI Emulating = new EmuAPI();
  String[] test = Emulating.getDevice();
String[] test1 = Emulating.getDeviceType();
  String[] test2 = Emulating.getdeviceModALcatel();
  String[] testing = Emulating.getdeviceModLG();

public void fillComboBox1() {
   jComboBox1.addItem(test[0]);
      jComboBox1.addItem(test[1]);
      jComboBox1.addItem(test[2]);
      jComboBox1.invalidate();     }

This is the code I am using to fill the second jComboBox2 that is giving 
me problem

public void fillComboBox2(){
 iIndex = jComboBox1.getSelectedIndex();
     switch (iIndex)
      {
         case 0:
              jComboBox2.addItem(test1[0]);
              jComboBox2.addItem(test1[1]);
              jComboBox2.addItem(test1[2]);
              jComboBox2.addItem(test1[3]);
              jComboBox2.addItem(test1[4]);
              jComboBox2.invalidate();
              break;
         case 1:
              jComboBox2.addItem(testing[0]);
              jComboBox2.addItem(testing[1]);
              jComboBox2.addItem(testing[2]);
              jComboBox2.addItem(testing[3]);
              jComboBox2.addItem(testing[4]);
              jComboBox2.invalidate();
              break;
         case 2:
              jComboBox2.addItem(test2[0]);
              jComboBox2.addItem(test2[1]);
              jComboBox2.addItem(test2[2]);
              jComboBox2.addItem(test2[3]);
              jComboBox2.addItem(test2[4]);
              jComboBox2.invalidate();
              break;
                      default:
  }
}

Please I will be so much obliged if anyone can help me out. I have 
limited time to complete this work

-- 
Ogunleye Olalekan Samuel
Room 300 CVC Laboratory
Department of Computer Science
University of Cape Town
South Africa
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Website: http://people.cs.uct.ac.za/~olaoye/