i want to implement more advance search than the filter toolbar in jqgrid so i changed my code to set multipleSearch: true:
jQuery("#grid").navGrid("#pager",
{ multipleSearch:true, add: false, edit: false, del: false },
{}, {}, {}, {}
i do get the Search Icon in my footer toolbar

but when i click on it, i just get the single field search GUI.

does anyone know why this would not show up the multiple search GUI? Am i missing some extra plugin or config setting ?
You should use
multipleSearch:trueinside another parameter of navGrid: