12. The method of claim 11 whereby selecting a top comprises the steps of: a) selecting a top formed from a dry erase material and comprising indicia; and b) writing on the top.
12. The method of claim 11 whereby selecting a top comprises the steps of: a) selecting a top formed from a dry erase material and comprising indicia; and b) writing on the top. 14. The tray assembly of claim 12 whereby one of said exchangeable tops defines a plurality of parallel lines and a plurality of letters positioned proximate at least one of the plurality of parallel lines.