gtk:popover-menu-add-child (popover child id)

popover -- a gtk:popover-menu widget
child -- a gtk:widget child widget to add
id -- a string for the ID to insert the child widget at

True if the ID was found and the child widget added.

Adds a custom widget to a generated menu. For this to work, the menu model of the popover must have an item with a custom attribute that matches the ID.