Bug 93400 LTK UI should provide official API for structural content in the preview page
org.eclipse.ltk.ui.refactoring/src/org/eclipse/ltk/internal/ui/refactoring/TextEditChangeElement.java
private static final ChangeElement[] fgChildren= new ChangeElement[0];
	
	private TextEditBasedChangeGroup fChangeGroup;
	
	public TextEditChangeElement(ChangeElement parent, TextEditBasedChangeGroup changeGroup) {
		super(parent);
		fChangeGroup= changeGroup;
		Assert.isNotNull(fChangeGroup);
	}
	
	/**
	 * Returns the <code>TextEditBasedChangeGroup</code> managed by this node.
	 * 
	 * @return the <code>TextEditBasedChangeGroup</code>
	 */