Deleting an item from the item page doesn't close confirmation popup in IE

[Nicklas Nordborg]

1. Create any kind of item, for example a biosource.
2. Click on the item and go to the view page.
3. Click on 'Delete' and then on the 'trashcan' icon.
4. Accept to 'Delete this item permanently'.
5. The 'Biosource delete' confirmation dialog is shown but is never closed and the main page is not re-directed to the list page.

This happens in IE only, it works as expected in Firefox.

[Nicklas Nordborg]

(In [6973]) Fixes #1956: Deleting an item from the item page doesn't close confirmation popup in IE

The event to send to the main page must be created by the document object on the main page and not by the document object in the popup and the event type should be a CustomEvent.