dojo Enhanced Grid not showing any message when no data is there -

i have enhanced grid, if pass empty json grid not showing message.

var newstore = new dojo.data.itemfilereadstore ({         data : result }); gridid.setstore(newstore); gridid.startup(); gridid.loadingmessage = "loading"; gridid.errormessage = "error!!!"; gridid.nodatamessage = "no data found"; 

then not showing message.