Bug 142432 MasterPage from library can't be restored to modify
Details: MasterPage from library can't be restored to modify Step: 1.New a library named lib1, and insert a masterpage named lib-mp. 2.Publish the library into resource folder. 3.New a report design and use lib1. 4.Drop the lib-mp from library explorer into outline of report design. 5.Double click lib-mp, and switch to Property editro tab. 6.Click restore. Actual result: Pop up an error message and said that the master page cannot specify size the page type is not custom.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
* container of a report item is the section or other report item in which
	 * it appears.
	 * 
	 * @return a handle to the container element.
	 */
	public DesignElementHandle getContainer( )
	{
		DesignElement element = getElement( ).getContainer( );
		if ( element == null )
			return null;
		return element.getHandle( module );
	}
	/**
	 * Moves this element to a new location within the design.
	 * 
	 * @param newContainer
	 *            the new container element
	 * @param toSlot
	 *            the target slot within the new container
	 * @throws ContentException
	 *             If the element cannot be placed into the target element or
	 *             slot, perhaps because the element is of the wrong type, the
	 *             slot is full, or other error.
	 * @see SlotHandle
	 */
	public void moveTo( DesignElementHandle newContainer, int toSlot )
			throws ContentException
	{
		DesignElement element = getElement( );
		DesignElement oldContainer = element.getContainer( );