Hi Andie,
No It shoud be present in your Window IMPL or View IMP or OVP IMPL. I'll tell you how to find it,
First go to your IMPL Class There Search for all methods with following symbol a (marked in red box)
This Symbol Indicates that it is a Event Handler, Now you need to find the Event Registered to this Method, To do that Select the particular method and click on the button indicated below
Now you will see the Event Handler Associated with the Method S elected.
So like this go and check all the methods in your IMPL class of your window View and Overview Page
If you have done this, you will be able to find the Method which Creates that popup.
Regards,
Pratheek