如何确定Twitter引导组件事件的来源

如果我在一个元素上使用工具提示和popover Twitter Bootstrap Javascript组件，我如何确定哪个组件触发了"显示"事件？

例如：

$("#button").tooltip();
$("#button").popover();
$("#button").on("shown", function(event) {
    // I need to do some (flash) stuff that's specific to the popover content,
    // the shown event is fired for both the tooltip and popover but doesn't 
    // appear to include any useful information about the context of the event.
    // How do I determine if the popover component fired the event? The event.target
    // is useless because it points to #button.
    // The best I've come up with is to check if the element I'm interested in 
    // is visible but I'm assuming this will have issues if the popover component
    // is animated...
    if ($(".popover .thingy").is(':visible')) {
    }
});