Creating popup with message on button click

Hi,

I am new to flash

I have a form where using submitting the form and it sends the email

as soon as button is clicked I get a pop up mesage saying Sending email.... please wait

I am struggling finding fro where that popup comes from which layer.

I can see in action script code where it is doing visible true to that pop up.

but where is that layer.

Do you have any tutorials/Video where I can learn this type of thing.

Thanks again