[急]黑莓向可滚动的VerticalFieldManager添加ButtonField，导致屏幕错误

[急]黑莓向可滚动的VerticalFieldManager添加ButtonField，导致屏幕异常

package com.test;


import net.rim.device.api.system.Display;

import net.rim.device.api.ui.Color;

import net.rim.device.api.ui.Field;

import net.rim.device.api.ui.FieldChangeListener;

import net.rim.device.api.ui.Graphics;

import net.rim.device.api.ui.Manager;

import net.rim.device.api.ui.component.ButtonField;

import net.rim.device.api.ui.container.HorizontalFieldManager;

import net.rim.device.api.ui.container.MainScreen;

import net.rim.device.api.ui.container.VerticalFieldManager;


public class ManagerScreen extends MainScreen {


	private VerticalFieldManager bodyManager,b1,b2,b3,b4,b5,b6;

	private ButtonField bt1,bt2,bt3,bt4,bt5,bt6;

	private ButtonField bt11,bt22,bt33,bt44,bt55,bt66;

	private int i;


	public ManagerScreen() {

		HorizontalFieldManager t = new HorizontalFieldManager(){

			protected void paintBackground(Graphics g) {

				// TODO Auto-generated method stub

				g.setColor(Color.GRAY);

				g.fillRect(0, 0, Display.getWidth(), Display.getHeight()/4/2);

				super.paintBackground(g);

			}

			protected void sublayout(int maxWidth, int maxHeight) {

				// TODO Auto-generated method stub

				maxWidth = Display.getWidth();

				maxHeight = Display.getHeight()/4/2;

				super.sublayout(maxWidth, maxHeight);

				setExtent(maxWidth, maxHeight);

			}

		};


		HorizontalFieldManager f = new HorizontalFieldManager(){

			protected void paintBackground(Graphics g) {

				// TODO Auto-generated method stub

				g.setColor(Color.GRAY);

				g.fillRect(0, 0, Display.getWidth(), Display.getHeight()/4/2);

				super.paintBackground(g);

			}

			protected void sublayout(int maxWidth, int maxHeight) {

				// TODO Auto-generated method stub

				maxWidth = Display.getWidth();

				maxHeight = Display.getHeight()/4/2;

				super.sublayout(maxWidth, maxHeight);

				setExtent(maxWidth, maxHeight);

			}

		};


		bodyManager = new VerticalFieldManager(Manager.VERTICAL_SCROLL|Manager.VERTICAL_SCROLLBAR){

			protected void sublayout(int maxWidth, int maxHeight) {

				// TODO Auto-generated method stub

				maxWidth = Display.getWidth();

				maxHeight = Display.getHeight()-Display.getHeight()/4;

				super.sublayout(maxWidth, maxHeight);

				setExtent(maxWidth, maxHeight);

			}

		};

		bt1 = new ButtonField("bt1",ButtonField.CONSUME_CLICK);

		bt11 = new ButtonField("bt11",ButtonField.CONSUME_CLICK);

		bt2 = new ButtonField("bt2",ButtonField.CONSUME_CLICK);

		bt22 = new ButtonField("bt22",ButtonField.CONSUME_CLICK);

		bt3 = new ButtonField("bt3",ButtonField.CONSUME_CLICK);

		bt33 = new ButtonField("bt33",ButtonField.CONSUME_CLICK);

		bt4 = new ButtonField("bt4",ButtonField.CONSUME_CLICK);

		bt44 = new ButtonField("bt44",ButtonField.CONSUME_CLICK);

		bt5 = new ButtonField("bt5",ButtonField.CONSUME_CLICK);

		bt55 = new ButtonField("bt55",ButtonField.CONSUME_CLICK);

		bt6 = new ButtonField("bt6",ButtonField.CONSUME_CLICK);

		bt66 = new ButtonField("bt66",ButtonField.CONSUME_CLICK);