------------------------------------------------------ Window management methods
function() {
        var x = 0, y = 0,
            zmgr = this.getDesktopZIndexManager();

        zmgr.eachBottomUp(function(win) {
            if (win.isWindow && win.isVisible() && !win.maximized) {
                win.setPosition(x, y);
                x += 20;
                y += 20;
            }
        });
    }