Bug 121352 The data set binding property cannot be retrieved in report preview layout
In report preview page, the datasource/dataset property binding lists cannot be retrieved. The dataset binding can not work correctly in layout preview because it's value cannot get from the binding list. But in the data set edit page, the binding value can be got. You can refer to the attachment.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentReplaceRecord.java
protected final DesignElement newElement;
	/**
	 * The old element.
	 */
	protected final DesignElement oldElement;
	/**
	 * The slot within the container.
	 */
	protected int slotID = 0;
	/**
	 * The module set when using element IDs.
	 */
	protected final Module module;
	/**
	 * The position where the old element or the new element exsits.
	 */
	protected int posn;
	/**
	 * The container slot where the record executes.
	 */
	protected ContainerSlot slot = null;
	/**
	 * Constructs the record with container element, slot id, old element, and
	 * new element.
	 * 
	 * @param module
	 *            the module in which this record executes
	 * @param containerObj
	 *            The container element.
	 * @param theSlot