//apply CSS classes and labels to buttons
        this.container.find('.applyBtn, .cancelBtn').addClass(this.buttonClasses);
        if (this.applyButtonClasses.length)
            this.container.find('.applyBtn').addClass(this.applyButtonClasses);
        if (this.cancelButtonClasses.length)
            this.container.find('.cancelBtn').addClass(this.cancelButtonClasses);