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
*            the module
	 * @return the list of the errors found in validation, each of which is the
	 *         <code>SemanticException</code> object.
	 */
	public final List validateWithContents( Module module )
	{
		ElementDefn elementDefn = (ElementDefn) getDefn( );
		List validatorList = ValidationExecutor.getValidationNodes( this,
				elementDefn.getTriggerDefnSet( ), true );
		ValidationExecutor executor = module.getValidationExecutor( );
		errors = executor.perform( this, validatorList );
		List list = new ArrayList( errors );
		int count = getDefn( ).getSlotCount( );
		for ( int i = 0; i < count; i++ )
		{
			Iterator iter = getSlot( i ).iterator( );
			while ( iter.hasNext( ) )
			{
				list.addAll( ( (DesignElement) iter.next( ) )
						.validateWithContents( module ) );
			}
		}
		return list;
	}
	/**
	 * Validates only this element without its contents, and return error list.
	 * The derived class should override this method to define specific
	 * validation rules.
	 * 
	 * @param module