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/ContentRecord.java
protected DesignElement content = null;
	/**
	 * The slot within the container.
	 */
	protected int slotID = 0;
	/**
	 * Whether to add or remove the element.
	 */
	protected boolean add = true;
	/**
	 * Memento for the old element position when deleting the element.
	 */
	protected int oldPosn = -1;
	/**
	 * The module set when using element IDs.
	 */
	protected final Module module;
	/**
	 * Constructs the record with container element, slot id, content element,
	 * and flag for adding or dropping.
	 * 
	 * @param module
	 *            the module in which this record executes
	 * @param containerObj
	 *            The container element.
	 * @param theSlot
	 *            The slotID in which to put the content.
	 * @param contentObj
	 *            The content object to add or remove.
	 * @param isAdd