swt怎么给TabItem添加滚动条？

rt，帮我看看我的代码那里有问题，滚动条显示不出来

public class ProjectGUI extends Composite {

private Text textArea;
/**
* Create the composite
* @param parent
* @param style
*/
public ProjectGUI(Composite parent, int style) {
super(parent, style);
setLayout(new FormLayout());

final TabFolder tabFolder = new TabFolder(this, SWT.NONE);
final FormData formData = new FormData();
formData.bottom = new FormAttachment(100, -5);
formData.right = new FormAttachment(100, -5);
formData.top = new FormAttachment(0, 5);
formData.left = new FormAttachment(0, 5);
tabFolder.setLayoutData(formData);

final TabItem tabText = new TabItem(tabFolder, SWT.NONE);
tabText.setText("文本编辑");

textArea = new Text(tabFolder, SWT.BORDER);
tabText.setControl(textArea);

final TabItem tabTable = new TabItem(tabFolder, SWT.NONE);
tabTable.setText("界面控制");

final TabFolder tabFolder_1 = new TabFolder(tabFolder, SWT.NONE);
tabTable.setControl(tabFolder_1);

final TabItem tabView = new TabItem(tabFolder_1, SWT.NONE);
tabView.setText("流程图");

final TabItem tabValues = new TabItem(tabFolder_1, SWT.NONE);
tabValues.setText("控制变量,总参数");

tabFolder_1.setLayout(new FillLayout());
final ScrolledComposite scrolledComposite = new ScrolledComposite(tabFolder_1, SWT.BORDER ¦ SWT.H_SCROLL ¦ SWT.V_SCROLL);
scrolledComposite.setExpandHorizontal(true);
    scrolledComposite.setExpandVertical(true);
PropertyPage pp = new PropertyPage(scrolledComposite, SWT.NONE);
scrolledComposite.setContent(pp);
tabValues.setControl(scrolledComposite);


final TabItem tabItem = new TabItem(tabFolder_1, SWT.NONE);
tabItem.setText("进口条件");

final TabItem tabItem_1 = new TabItem(tabFolder_1, SWT.NONE);
tabItem_1.setText("流路和附面层堵塞系数");

final TabItem tabItem_2 = new TabItem(tabFolder_1, SWT.NONE);
tabItem_2.setText("离散点计算站");

final TabItem tabItem_3 = new TabItem(tabFolder_1, SWT.NONE);
tabItem_3.setText("叶排参数");

final TabItem tabItem_4 = new TabItem(tabFolder_1, SWT.NONE);
tabItem_4.setText("流量比");
}

@Override
public void dispose() {
super.dispose();
}

@Override
protected void checkSubclass() {
// Disable the check that prevents subclassing of SWT components
}

}

另外我想用eclispe rpc做双击treeview的一项。就在界面中间打开一个文件这样的功能，谁知道怎么做，treeview的change事件如何调用jface的Action打开view。