There is no JavaScript error.
It renders the child grid but nothing in body so no data.
I removed the checkbox still it doesn't work.
I am calling the stored procedure based on Invoice string which I am trying to pass using invoices = "#=INVOICE#" but the problem controller is not getting called.
I see div Id is getting invoice value:
<div class="k-widget k-grid" id="Grid_F300003787 ">