Bug 177405 [Preferences] Layout issues with Text Boxes and Scrollbars
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
messageData.top = new FormAttachment(0);
		messageData.bottom = new FormAttachment(100);
		messageData.right = new FormAttachment(100);
		messageData.left = new FormAttachment(0);
		return messageData;
	}
	/**
	 * @param parent
	 *            the SWT parent for the tree area controls.
	 * @return the new <code>Control</code>.
	 * @since 3.0
	 */
	protected Control createTreeAreaContents(Composite parent) {
		
		treeViewer = createTreeViewer(parent);
		treeViewer.setInput(getPreferenceManager());
		updateTreeFont(JFaceResources.getDialogFont());
		layoutTreeAreaControl(treeViewer.getControl());
		return treeViewer.getControl();
	}
	/**
	 * Create a new <code>TreeViewer</code>.
	 * 
	 * @param parent
	 *            the parent <code>Composite</code>.
	 * @return the <code>TreeViewer</code>.
	 * @since 3.0
	 */
	protected TreeViewer createTreeViewer(Composite parent) {
		final TreeViewer viewer = new TreeViewer(parent, SWT.NONE);