PropertyHandle propHandle = getPropertyHandle( DesignElement.PROPERTY_MASKS_PROP );
PropertyHandle propHandle = getPropertyHandle( IDesignElementModel.PROPERTY_MASKS_PROP );
	public Iterator propertyMaskIterator( )	{		PropertyHandle propHandle = getPropertyHandle( DesignElement.PROPERTY_MASKS_PROP );		assert propHandle != null;		return propHandle.iterator( );	}