Bug 136241 [regression]Preview template in web viewer and pdf didn't get correct effect.
Description: Preview template items in web viewer and pdf didn't get correct effect. Steps to reproduce: 1. Create template items. 2. Preview in Web Viewer and pdf. Expected result: Same effect as in html. Actual result: In web viewer, see only blank box. In pdf, blank page.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
*            the container element
	 */
	public ContentCommand( Module module, DesignElement container )
	{
		super( module, container );
	}
	/**
	 * Adds a new element into a container and specifies the position in the
	 * container. Virtually all elements must reside in a container. Containers
	 * are identified by a container ID. The application creates the element
	 * object, then adds it to the container here. The undo of this operation
	 * effectively deletes the element.
	 * 
	 * @param content
	 *            the element to add
	 * @param slotID
	 *            the slot in which to add the component
	 * @param newPos
	 *            the position index at which the content to be inserted. If
	 *            it's -1, the content will be inserted at the end of the slot.
	 * @throws ContentException
	 *             if the content cannot be added into this container.
	 * @throws NameException
	 *             if the name of the content exists in name space.
	 */
	public void add( DesignElement content, int slotID, int newPos )
			throws ContentException, NameException
	{
		assert newPos >= 0 || newPos == -1;
		doAdd( content, slotID, newPos );