APEX 5 DA when cancelling modal dialog

I needed to have a dynamic action that fires when a modal dialog is cancelled or the escape key is pressed. To do this in APEX 5, on the parent page, you can create a dynamic action based on a custom event called dialogclose.

Parent page:
Custom Dynamic Action

When:
Event: Custom
Custom Event: dialogclose
Selection Type: JavaScript Expression
JavaScript Expression: document

The True/False actions can be set as usual, such as refreshing a report or setting some value.