what is the event property of switching tab when using angularjs2-tabs? 
 < tabs > 
<tab tabTitle="AAA">Content for Tab 1</tab>
<tab tabTitle="BBB">Content for Tab 2</tab>
 < / tabs > 
 I tried (click), which triggered, (select) when I clicked on something on the tab page, not an event. 
 ask all the gods to help. Thank you 
