Getting selected records in Web action menu

Hi All

          I need to find the selected records of the multiselect user control grid in the Web action menu class of the page EPPurchTableInfo. These are the steps I followed.

        1. Added AllowMarking attribute to true in the grid.

        2.Used the following to get the selected records. But it is not working

   multiSelectionContext = _args.multiSelectionContext() ;

   if(multiSelectionContext)

   {

       multiSelectionRecord = multiSelectionContext.getFirst();

//not getting into this loop

       while (multiSelectionRecord)

       {

            multiSelectionRecord = multiSelectionContext.getNext();

       }

   }

 The multiSelectionRecord value is not available