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
{
					DesignElementHandle tmpElement = slot.get( i );
					if ( tmpElement.getDefn( ) == elementDefn )
						tagIndex++;
				}
				posnInfo = "[" + tagIndex + "]";
			}
			String elementPath = ""; 
			if ( !StringUtil.isBlank( slotInfo ) )
				elementPath = slotInfo;
			elementPath = elementPath + "/" + elementDefn.getXmlElement( ); 
			if ( !StringUtil.isBlank( posnInfo ) )
				elementPath = elementPath + posnInfo;
			sb.insert( 0, elementPath );
			element = container;
		} while ( element != null );
		return sb.toString( );
	}
	/**
	 * Gets a string that defines the event handle class.
	 * 
	 * @return the expression as a string
	 * 
	 * @see #setEventHandlerClass(String)
	 */
	public String getEventHandlerClass( )
	{
		return getStringProperty( GroupElement.EVENT_HANDLER_CLASS_PROP );
	}
	/**