If you want the grid to resize when you resize the browser window, you can do something like this:

$(window).bind('resize', function() {
  var grid_container_width = $('#your_grid').width();
  var window_width = $(window).width() -80;
  var resize_width = window_width < grid_container_width ? window_width : grid_container_width;
  $('#your_grid').setGridWidth(resize_width);
 }).trigger('resize');

Boson