$(".ui-multiselect-costum-button",$(this)).click(function(){
                console.log($(this).parent().html());
                console.log($(this).attr("class"));
                $(this).removeClass("ui-multiselect-costum-button").addClass("ui-multiselect-costum-button-active");
                console.log($(this).attr("class"));
                console.log($(this).parent().html());
            });

            $(".ui-multiselect-costum-button-active",$(this)).click(function(){

                console.log($(this).attr("class"));
                $(this).removeClass("ui-multiselect-costum-button-active").addClass("ui-multiselect-costum-button");
                console.log($(this).attr("class"));
            });

<input type="checkbox" value="2" style="display: none;"><span class="ui-multiselect-costum-button"></span>
 ui-multiselect-costum-button
 ui-multiselect-costum-button-active
 <input type="checkbox" value="2" style="display: none;"><span class="ui-multiselect-costum-button-active"></span>

 <input type="checkbox" value="2" style="display: none;"><span class="ui-multiselect-costum-button-active"></span>
 ui-multiselect-costum-button-active
 ui-multiselect-costum-button-active
 <input type="checkbox" value="2" style="display: none;"><span class="ui-multiselect-costum-button-active"></span>

$(this).on("click", ".ui-multiselect-costum-button", function(){
            console.log($(this).parent().html());
            console.log($(this).attr("class"));
            $(this).removeClass("ui-multiselect-costum-button").addClass("ui-multiselect-costum-button-active");
            console.log($(this).attr("class"));
            console.log($(this).parent().html());
        });

        $(this).on("click", ".ui-multiselect-costum-button-active", function(){
            console.log($(this).attr("class"));
            $(this).removeClass("ui-multiselect-costum-button-active").addClass("ui-multiselect-costum-button");
            console.log($(this).attr("class"));
        });