cancel tab closing in p:accordionPanel - jsf

Question

I have a p:accordionPanel and inside of each tab of the panel there is some info that the user can manipulate, what i need to do is if the user close the tab show a confirm dialog (before the tab get closed) whit something like "are you sure you wanna close the tab? if you do your changes will be lost". here is what i tried
<p:ajax event="tabClose" onstart="return myFunction()"
listener" {myBean.myMethod}" process="#this" />
function myFunction() {
var answer = confirm("are you sure you wanna close the tab? if you do your changes will be lost");
if(answer){
//some logic
return true;
}else{
//some logic
return false;
}
}
The problem is that if i choose cancel on the confirm dialog the tab get close anyway. Shouldn't the tab closing be canceled by the onStart="return false"? is there a way to achieve what i'm trying to do?

Answer 1

Finally I solved my problem, apparently the onStart="return false" does not prevent the tab from change its statatus but the onTabChange attribute of the p:accordionPanel does, the only problem is that for some reason the onTabchange event of the accordion don't get execute when the tab is been closed just when the tab is been opened so i have to override the acordionPanel unselect function of primefaces to call the onTabChange event
PrimeFaces.widget.AccordionPanel.prototype.unselect = (function(index) {
var cached_function = PrimeFaces.widget.AccordionPanel.prototype.unselect;
return function() {
var panel = this.panels.eq(index);
if(this.cfg.onTabChange) {
var result = this.cfg.onTabChange.call(this, panel);
if(result === false)
return false;
}
var result = cached_function.apply(this, arguments);
return result;
};
})();
then i only had to placed myFunction(); on the onTabChange event of the accordiong panel (onTabChange="return myFunction()")and it works.