Hello, Found this while looking for the answer myself. The vanity door fell off last night onto my foot and so needs must as it really hurt!
Anyway there are 2 top pillars that fit into the upper appliance door. Then there are two plates that need to set to finished height.
To fit. First insert the top pillars into the large openings. Now open the dishwasher door a bit, took two of us to get this right, and push the vanity door as high up as you can. Next slide the door back down and gently push the bottom plates into the recesses on the appliance door.
Job done! Well almost. When you have got this far open the dishwasher door completely. You will see a plastic white cover caps on either side of the door. Remove these and drop a screw into the hole.. Make sure you measure the screw against the vanity door so that the screw does not go all the way through!! Now screw the appliance door to the vanity door.. Now the job is now complete!
Hope this helps!
Kev, September 2012