Flex :: Make All The Popups Retain Their Functionality After The One Before Is Closed?

I have a for loop that I'm trying to display multiple popups with.

I seem to have multiple popups appearing on the screen, but after I'm done and close the top popup all the buttons on the others below it seem to stop functioning.

How can I make all the popups retain their functionality after the one before is closed?

Here's the code that I'm using to add the popups:

reminderadd = reminder_add(PopUpManager.createPopUp(this,reminder_add,true));
reminderadd.postpone_button.visible = true;
reminderadd.title.text = "Reminder - " + remindernum;
reminderadd["add_button"].addEventListener("click",reminderUpdate);
reminderadd["cancel_button"].addEventListener("click",reminderDismiss);
PopUpManager.centerPopUp(reminderadd);