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
* return null</li>
	 * <li>SHORT_LABEL: All the above 5 steps can be visited. This will ensure
	 * there will be a return value</li>
	 * <li>FULL_LABEL: Besides the return value of SHORT_LABEL, this option
	 * says we need to return additional information. To get this, every child
	 * element needs to overwrite this method</li>
	 * </ul>
	 * 
	 * @param module
	 *            the module
	 * @param level
	 *            the description level.
	 * @return the display label of this element.
	 */
	public String getDisplayLabel( Module module, int level )
	{
		String displayLabel = module.getMessage( getDisplayNameID( ) );
		if ( StringUtil.isBlank( displayLabel ) )
		{
			displayLabel = getDisplayName( );
		}
		if ( StringUtil.isBlank( displayLabel ) )
		{
			displayLabel = getNameForDisplayLabel( );
		}
		if ( level == USER_LABEL )
		{
			return displayLabel;
		}
		MetaDataDictionary dictionary = MetaDataDictionary.getInstance( );