gistfile1.js

$('.level1>.x-panel-bwrap>.x-panel-tbar, .level2>.x-panel-bwrap>.x-panel-tbar, .level3>.x-panel-bwrap>.x-panel-tbar').click(function(){
            parent = this.parentNode;
            body = $(parent).children('.x-panel-body');
            xpanel = $(body).children('.x-panel');
            // I always specifically open and close because I've seen some issues with toggleClass. - CM
            if($(this).hasClass('open')) {
                $(this).removeClass('open');
                $(xpanel).removeClass('open');
            } else {
                $(this).addClass('open');
                $(xpanel).addClass('open');
            }
        });