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 false if the module is a library and the element to insert is a
	 *         template element or its content is a template element; or the
	 *         container is report design and slot is component slot and the
	 *         element to insert is a template element or its content is a
	 *         template element; otherwise true
	 */
	private boolean canContainTemplateElement( Module module, int slotID,
			DesignElement element )
	{
		
		
		IElementDefn defn = MetaDataDictionary.getInstance( ).getElement(
				ReportDesignConstants.TEMPLATE_ELEMENT );
		if ( element instanceof TemplateElement )
			return canContainTemplateElement( module, slotID, defn );
		ContentIterator contents = new ContentIterator( element );
		while ( contents.hasNext( ) )
		{
			DesignElement content = (DesignElement) contents.next( );
			if ( content instanceof TemplateElement )
				return canContainTemplateElement( module, slotID, defn );
		}
		return true;
	}
	/**
	 * Checks whether the element to insert can reside in the given module.
	 * 
	 * @param module
	 *            the root module of the element to add
	 * @param slotID