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I am using listbox and grouping some listItems.
 Problem I am facing is I have grouped my items using GroupsModelArray class but i again want to group inside group. say for eg here i have grouped by birth now I want to again group inside birth by regular & optional. can anyone suggest me something? 
 for example: i have list of vaccines i have grouped them by birth/6 weeks/12 weeks etc now inside birth i want to group them by regular/optional.
code:

    code:
 
 GroupsModelArray groupModel = new GroupsModelArray(listValue, new RowLabelComparator("null",true));                 elementObj.setModel(groupModel);
                 if(elementObj instanceof Listbox)
                 {
                     ItemRendererArray itemRenderer = new ItemRendererArray();
                     if(gridDef != null)
                     {
                         itemRenderer.setGridDef(gridDef);
                     }               
                     elementObj.setItemRenderer(itemRenderer);
                 }
                 else 
                 {
                     elementObj.setRowRenderer(new GridRowCustomRenderer());
                 }

 public class RowLabelComparator extends FieldComparator 
 {
     public RowLabelComparator(String orderBy, boolean asc) 
     { 
         super(orderBy, asc); 
     }
     public int compare(Object o1, Object o2) 
     {
         Object[] listValue1 = (Object[])o1;
         Object[] listValue2 = (Object[])o2;
         System.out.println("listValue length="+listValue1.length);
         int objectCounter =0;
         Object retValue = null;
         String[][] dummyValues = new String[listValue1.length][];
         int lengthOfList = listValue1.length;
         int dueIndex = 0;
         int regularOptionalIndex = 1;

         Object obj1 = listValue1[dueIndex];
         Object obj2 = listValue2[dueIndex];

         Object objVaccineType1 = listValue1[regularOptionalIndex];
         Object objVaccineType2 = listValue2[regularOptionalIndex];

         if(obj1!= null && !obj1.getClass().isArray())
         {
             if(obj!=null)
             {
                 String str1 = obj1.toString();
                 String str2 = obj2.toString();
                 int valueOf1 = 0;
                 str1 = str1.trim();
                 if(str1.equals(str2))
                 {
                     if(objVaccineType1.equals(objVaccineType2) && objVaccineType1.equalsIgnoreCase("regular"))
                     {
                         valueOf1 = 0;                       
                     }
                     else if(objVaccineType1.equals(objVaccineType2) && objVaccineType1.equalsIgnoreCase("optional"))
                     {
                         valueOf1 = 0;                       
                     }                   
                 }
                 else if(str1.equals("Birth"))
                 {
                     valueOf1 = 2;
                 }
                 else if(str1.equals("6 Weeks"))
                 {
                     valueOf1 = 3;
                 }                   
                 else if(str1.equals("10 Weeks"))
                 {
                     valueOf1 = 4;
                 }   
                 else if(str1.equals("14 Weeks"))
                 {
                     valueOf1 = 5;
                 }   
                 else if(str1.equals("18 Weeks"))
                 {
                     valueOf1 = 6;
                 }
                 else if(str1.equals("22 Weeks"))
                 {
                     valueOf1 = 7;
                 }
                 else if(str1.equals("6 Months"))
                 {
                     valueOf1 = 8;
                 }
                 else if(str1.equals("9 Months"))
                 {
                     valueOf1 = 9;
                 }
                 else if(str1.equals("1 Year"))
                 {
                     valueOf1 = 10;
                 }                   
                 else if(str1.equals("15 Months"))
                 {
                     valueOf1 = 11;
                 }
                 else if(str1.equals("18 Months"))
                 {
                     valueOf1 = 12;
                 }
                 else if(str1.equals("2 Years"))
                 {
                     valueOf1 = 13;
                 }
                 else if(str1.equals("5 Years"))
                 {
                     valueOf1 = 14;
                 }                   
                 System.out.println("str1="+str1);
                 System.out.println("str2="+str2);                   
                 return valueOf1;
             }           
         }
         return -1; 
     }
 }