updating part custom properties from drawing title block

In SW 2008 I find the new functionality of being able toupdate part custom propeties from assembly BOMs very useful. As mydrawing sheets import part custom properties I would find it veryuseful to have the same capability of updating the part customproperties from the drawing sheet in the title block.
Have tried a couple of methods to achieve this.
A). using a Predefined Bom for the title block. Not verySatisfactory
B) inserting a Bom on the part drawing and updating the propertiesthere.
Also tried figuring out how the Bom does it. No Success

Does anybody know how to do this?SolidworksDrawings And Detailing