android 的dialog的问题，想要删除标题，但是dialog的内容也不见了

RedPackageTest rg = new RedPackageTest(activity, "", null, 0, null, "wyh");
rg.requestWindowFeature(Window.FEATURE_NO_TITLE);
rg.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
rg.show();
上面是我自己写的一个dialog。
public class RedPackageTest extends Dialog
{
public interface OnCustomDialogListener
{
public void back(String name);
}

private int                     style;
private String                  name;
private OnCustomDialogListener  customDialogListener;
private ImageButton             getRedPackage;
private TextView                noRedPackage;
private TextView                offDateRedPackage;
private TextView                outOfRedPackage;
private TextView                toSeeOthersRedPackage;
private Drawable                photo;
private String                  username;

public RedPackageTest(Context context, String name, OnCustomDialogListener customDialogListener, int style, Drawable photo,
        String username)
{
    super(context);
    this.name = name;
    this.customDialogListener = customDialogListener;
    this.style = style;
    this.photo = photo;
    this.username = username;
}

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.cs__red_package_view_page);
    // 设置标题
    setTitle(name);
    getRedPackage = (ImageButton) findViewById(R.id.get_red_package);
    noRedPackage = (TextView) findViewById(R.id.out_of_red_package);
    toSeeOthersRedPackage = (TextView) findViewById(R.id.to_see_others_red_package);
    if (username == null || "".equals(username))
    {
        username = "unknown";
    }

    getRedPackage.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {

        }
    });
    toSeeOthersRedPackage.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {

        }
    });

}

}
这个是我写的类

http://ask.csdn.net/questions/156

不需要这个吧:rg.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));

你这个dialog能显示吗？自定义后不用show吗？