jQuery Grid Plugin - jqGrid

I have jQuery Grid in a document and a link in a iFrame. What I need, is to reaload the grid when link has been clicked.

This code doesn't work in iFrame

jQuery("#mylist", window.top.document).trigger("reloadGrid");

This code returns "mylist"

alert(jQuery("#mylist", window.top.document).attr('id'));

And this works but only in document (not in iFrame):

jQuery("#mylist").trigger("reloadGrid");