[Dojo-interest] visual cue for grid header ( sorting)

[G. Sharon Yang]

Hello,

It seems that in all the grid test examples, each column is sortable,
but without any visual cue. I would like to make some visual cue to
let users know that those column headers are clickable.  Can we, at
the time of creating the grid, specify a column to sort? That will
help the user because the arrow will be there, so that gives them a
cue that all the columns are sortable.

Thanks,

-S.