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/core/DesignElement.java
implements
			IDesignElement,
			IPropertySet,
			IDesignElementModel
{
	/**
	 * The max length the display label for every element. If the length exceeds
	 * this limit, the exceeding part will be shown as "...".
	 */
	private static final int MAX_DISPLAY_LABEL_LEN = 30;
	/**
	 * Elements have an optional name. The name may be required by some element
	 * types. If so, the derived element class should enforce the use of the
	 * name. The name is non-localizable.
	 * <p>
	 * The name often occurs in a name space. Derived classes must enforce the
	 * name space rules. This class simply maintains the name itself.
	 */
	protected String name = null;
	/**