One option is to use the one click sort on the icons menu.
The one-click sort on the icons menu is a one-time sort, for a dynamic sort on a table calc create a new calculated field with the formula -[Calculation 12], set it to discrete, put it on the Rows Shelf as the right-most pill and then uncheck Show Headers:
As a courtesy to other forum users so they can see the conversation and make it more accessible, can you move it to the general forums? Instructions are here: http://community.tableau.com/docs/DOC-5065.
Thanks for your reply, somehow could not get your response on icon menu on calculated field.
Thanks a lot Jonathan for your great suggestion.
It worked for me.