如何更改ScrolledComposite的水平滚动增量?

我有一个显示ScrolledComposite的应用程序。用户抱怨水平滚动增量太小,即每次单击水平滚动箭头都会一次移动一个像素。他们希望单个的点击能引起更大的水平移动。有人能解释一下我是怎么做到的吗?下面是一段代码:

ScrolledComposite myScrolledComposite = new ScrolledComposite(parent, 
        SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);

if ( myScrolledComposite == null) {
    throw new NullPointerException("ScenePreView.java:  " + 
            "Method createPartControl()  " + 
            "ScrolledComposite myScrolledComposite == null."); 
}

Composite myComposite = new Composite(myScrolledComposite, SWT.NONE);

if ( myComposite == null) {
    throw new NullPointerException("ScenePreView.java:  " + 
            "Method createPartControl()  " + 
            "Composite myComposite == null."); 
}

myScrolledComposite.setContent(myComposite);