如何在jface对话框中添加头部？

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;

public class CustomDialog extends Dialog {

    public CustomDialog(Shell parentShell) {
        super(parentShell);
        setShellStyle(SWT.RESIZE | SWT.TITLE);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite container = (Composite) super.createDialogArea(parent);
        container.setLayout(new GridLayout(1, false));

        // 创建头部区域的Composite
        Composite headerComposite = new Composite(container, SWT.NONE);
        headerComposite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        headerComposite.setLayout(new GridLayout(2, false));

        // 添加标题Label
        Label titleLabel = new Label(headerComposite, SWT.NONE);
        titleLabel.setText("对话框标题");

        // 添加图标Image
        Image iconImage = new Image(Display.getCurrent(), "icon.png");
        Label iconLabel = new Label(headerComposite, SWT.NONE);
        iconLabel.setImage(iconImage);

        // 创建内容区域的Composite
        Composite contentComposite = new Composite(container, SWT.NONE);
        contentComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        contentComposite.setLayout(new GridLayout(1, false));

        // 在内容区域中添加其他控件

        return container;
    }

    @Override
    protected void createButtonsForButtonBar(Composite parent) {
        // 创建底部按钮区域的按钮
        Button okButton = createButton(parent, IDialogConstants.OK_ID, "确定", true);
        Button cancelButton = createButton(parent, IDialogConstants.CANCEL_ID, "取消", false);
    }

    @Override
    protected void configureShell(Shell newShell) {
        super.configureShell(newShell);
        newShell.setText("自定义对话框");
        newShell.setSize(400, 300);
        newShell.setImages(new Image[]{new Image(Display.getCurrent(), "icon.png")});
    }

    public static void openDialog(Shell parentShell) {
        CustomDialog dialog = new CustomDialog(parentShell);
        dialog.open();
    }
}

public class Main {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);

        Button openDialogButton = new Button(shell, SWT.PUSH);
        openDialogButton.setText("打开对话框");
        openDialogButton.addListener(SWT.Selection, event -> CustomDialog.openDialog(shell));

        shell.pack();
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }

        display.dispose();
    }
}