As stated in your documentation, it's possible to iniciate the selector with more than one filter of "^=" kind. But when I try to use that feature it doesn's seem to work. Should it work that way? May I actually use two or more filters of that kind (^=) in the same expression?
var procsGrid = $("#GridProcedimentos tr[id^='jnGridRow'] [id^='Grid_Linha'][id!='jnGridRowEmpty']");