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/Module.java
/**
	 * Finds a named report item in this module and the included modules. This
	 * is for body elements in the element's name space.
	 * 
	 * @param name
	 *            The name of the element to find.
	 * @return The element, or null if the element is not found.
	 */
	public DesignElement findElement( String name )
	{
		return resolveNativeElement( name, ELEMENT_NAME_SPACE );
	}
	/**
	 * Finds a data source by name in this module and the included modules.
	 * 
	 * @param name
	 *            the name of the data source to find.
	 * @return the data source, or null if the data source is not found.
	 */
	public DesignElement findDataSource( String name )
	{
		return resolveElement( name, DATA_SOURCE_NAME_SPACE, null );
	}
	/**
	 * Finds a data set by name in this module and the included modules.
	 * 
	 * @param name
	 *            the name of the data set to find.
	 * @return the data set, or null if the data set is not found.
	 */