fires when a tab is selected
| id | string|number | clicked tab id | 
| lastId | string|number | id of the previously active tab, if any | 
| boolean | true|false to allow/cancel selection | 
var myTabbar = new dhtmlXTabBar("parentId");
 
myTabbar.attachEvent("onSelect", function(id, lastId){
    // your code here
    return true;
});
Fires only for enabled tabs, return true|false to allow/cancel selecting
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