Modal windows while changing viewstack.selectedindex

Question

Hi!
I have a viewstack and on one view I push a button and call
below function. The viewstack changes but the screen freezes
without showing me my alert box.
Using "proper" PopUpManager functionality and a custom
component did not solve the problem. So how do you do it?
I want to click a button, show an Alter or custom popup with
further buttons which kan be either "ok" or "cancel". "ok" would
trigger another funtcion, but does not have to.
Any idea?
public function doit():void {
//Alert.show("Your changes have been saved","Success");
pollContainer.selectedIndex = 0;
}

Answer 1

private function promptUser(e:MouseEvent):void {
Alert.show("Are you sure you want to....?", "??", Alert.YES
| Alert.NO, this, userConfirmation, null, Alert.YES);
private function userConfirmation(e:CloseEvent):void {
if (e.detail == Alert.YES) {
//YES .... DO X
} else {
//NO .... DO Y
}