Add group as sub-menu into GenerateGroup

I am trying to add a group of actions as items in a new sub-menu into the generate popup menu.
The actions are listed in the generate menu, but directly, that is without a sub-menu containing them. Adding that same group to the tools menu works as expected (with a sub-menu containing the actions).
Is there an additional attribute (besides popup="true") required for adding a group as a sub-menu into the generate menu?

thanks in advance for any advice on this.

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Official comment

Generate doesn't allow `DefaultActionGroup` to be added as popup group but your custom `ActionGroup` should work well. Not sure that 3 layer popup is a good idea (the thirdt layer comes from template edition setting)

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