Dear paramvir,
I'm still here with my ignorance.
I tried to make a button in a page that only refreshes the grid, but it doesn't work.
I simpy did:
<div id="grid" style="margin: 0px auto;"></div>
<button id="btn_refresh_grid" type="button" > Refresh</button>
<script>
$( "#btn_refresh_grid" ).click(function() {
var grid = $('div#grid').pqGrid("getInstance").grid;
grid.refreshDataAndView();
});
</script>