1. A method in a warehouse management system for presenting instructions, said method comprising: querying a database of said warehouse management system, said database comprising at least one table storing tasks, said at least one table comprising (a) at least one column storing values related to warehouse storage items associated with said stored tasks, said warehouse storage items defining at least one widget class, each widget class comprising slot information that defines a physical position in relation to a plurality of available physical positions provided by each said widget class, and (b) an expression column defined as a function of said values of said at least one column, said database further comprising a render expression associated with said expression column; in response to said query of said database, receiving a result corresponding to at least one task of said stored tasks, said result comprising a value of said expression column modified by said render expression, said value corresponding to said at least one task; using said received result to generate a graphical representation associated with said at least one task; and displaying said generated graphical representation on a display screen of said warehouse management system; wherein the warehouse management system comprises a rendering toolkit for dynamic display of said widget class using user specified data.