Can you try the following:
$(document).ready(function() {
$("#stores").chained("#county");
$("#county").on("change", function(event) {
event = event || window.event;
event.preventDefault();
if ("" != $(this).val()) {
$("#storedropdown").fadeIn();
} else {
$("#storedropdown").hide();
$("#fsbuttons").hide();
}
});
$("#stores").on("change", function(event) {
event = event || window.event;
event.preventDefault();
if ("" != $(this).val()) {
$("#fsbuttons").fadeIn();
} else {
$("#fsbuttons").hide();
}
});
});