blackberry - opciones - ¿Cómo puedo seleccionar un menú desplegable que agregué sobre un campo de lista?

lista desplegable html javascript

Question

Hola amigo en mi aplicación BlackBerry uso un campo de lista, y sobre esta lista Campo agrego un menú desplegable. Ahora mi problema es cómo selecciono el menú desplegable que agregué sobre el campo de la lista. Ahora solo selecciono el campo de lista y no el menú desplegable, pero mi requisito es primero que seleccione el menú desplegable y luego la lista. He incluido mi código aquí, por favor revisalo.

public class TaskListField extends ListField implements ListFieldCallback, KeypadListener {
   private Vector rows;
   private Bitmap p1;
   private Bitmap p2;
   public LoginPage objLoginPage;

   public String[] data={"Call","Visit"};

   public String strIndex = null;
   public int tempIndex = 0;
   public int intvalue;
   public int id;
   public int value;
   public boolean hasFocus = false;
   public static String[] arrOutletName = { "Dosa Store", "Benfish Bhawan",
      "Nalban Park", "Korunamoyee", "206 Bus Stop", "aaaaaaaa",
      "bbbbbbbb", "ccccccccc", "dddddddd", "eeeeeee" };


   public ObjectChoiceField ocf;

   public TaskListField() {
      super(0, ListField.MULTI_SELECT);
      setRowHeight(80);
      setEmptyString("Hooray, no tasks here!", DrawStyle.HCENTER);
      setCallback(this);

      p1 = Bitmap.getBitmapResource("name.png");
      p2 = Bitmap.getBitmapResource("name.png");

      rows = new Vector();

      for (int x = 0; x < XmlHander.vectSrno.size(); x++) {
         TableRowManager row = new TableRowManager();

         strIndex = String.valueOf(x);
         String strVectno = XmlHander.vectSrno.elementAt(x).toString();
         String strSLADate = XmlHander.vectSldate.elementAt(x).toString();

         if (x % 2 == 0) {
            row.add(new BitmapField(null));
         }
         else {
            row.add(new BitmapField(null));
         }


         LabelField task = new LabelField(" ");

         if (x % 15 == 0) {
            task.setFont(Font.getDefault().derive(Font.BOLD | Font.UNDERLINED));
         } else {
            task.setFont(Font.getDefault().derive(Font.BOLD));
         }
         row.add(task);

         row.add(new LabelField(strVectno, DrawStyle.ELLIPSIS) {
            protected void paint(Graphics graphics) {
               graphics.setColor(0x00878787);
               // graphics.setColor(Color.PINK);
               super.paint(graphics);
            }
         });

         row.add(ocf=new ObjectChoiceField("",data){

            protected void paint(Graphics graphics){

               graphics.setColor(0x00878787);
               super.paint(graphics);
            }
         });

         ocf.setChangeListener(new FieldChangeListener(){

            public void fieldChanged(Field field, int context) {
               if(context != PROGRAMMATIC)
                  Dialog.alert(data[ocf.getSelectedIndex()]);
            }
         });

         rows.addElement(row);

      }
      setSize(rows.size());
   }


   public void drawListRow(ListField listField, Graphics g, int index, int y, int width) {
      TaskListField list = (TaskListField) listField;
      TableRowManager rowManager = (TableRowManager) list.rows.elementAt(index);

      rowManager.drawRow(g, 0, y, width, list.getRowHeight());
   }

   private class TableRowManager extends Manager {
      public TableRowManager() {
         super(0);
      }

      public void drawRow(Graphics g, int x, int y, int width, int height) {

         layout(width, height);

         setPosition(x, y);

         g.pushRegion(getExtent());

         subpaint(g);

         g.setColor(0x00CACACA);
         g.drawLine(0, 0, getPreferredWidth(), 0);

         g.popContext();
      }

      protected void sublayout(int width, int height) {

         int fontHeight = Font.getDefault().getHeight();
         int preferredWidth = getPreferredWidth();

         Field field = getField(0);
         layoutChild(field, 32, 32);
         setPositionChild(field, 0, 0);

         field = getField(1);
         layoutChild(field, preferredWidth - 16, fontHeight + 1);
         setPositionChild(field, 34, 3);

         field = getField(2);
         layoutChild(field, 150, fontHeight + 1);
         setPositionChild(field, 34, fontHeight + 6);

         field = getField(3);
         layoutChild(field, 150, fontHeight + 1);
         setPositionChild(field, preferredWidth - 152, fontHeight + 6);

         setExtent(preferredWidth, getPreferredHeight());
      }

      public int getPreferredWidth() {
         return Graphics.getScreenWidth();
      }

      public int getPreferredHeight() {
         return getRowHeight();
      }
   }

   public Object get(ListField listField, int index) {

      return null;
   }

   public int getPreferredWidth(ListField listField) {

      return 0;
   }

   public int indexOfList(ListField listField, String prefix, int start) {

      return 0;
   }

   protected boolean navigationClick(int status, int time) {
      final int index;
      index = this.getFieldWithFocusIndex() - 1;

      UiApplication.getUiApplication().invokeLater(new Runnable() {
         public void run() {

            UiApplication.getUiApplication().pushScreen(new Details(id));
         }
      });

      return false;
   }

   public int moveFocus(int amount, int status, int time) {

      invalidate(getSelectedIndex());
      id = this.getSelectedIndex();
      invalidate();

      return super.moveFocus(amount, status, time);
   }

   public void onFocus(int direction) {

      hasFocus = true;
      super.onFocus(direction);
      System.out.println("direction==" + direction);
      invalidate();
   }

   public void onUnfocus() {

      updateLayout();
      super.onUnfocus();
      invalidate();
   }

   private int getFieldWithFocusIndex() {
      return 0;
   }

}