TYPO3 Core

I tried to procedurally generate items inside the ActionMenuItemGroupViewHelper by using something like this:

<f:be.menus.actionMenu>
    <f:for each="{extensions}" as="template" key="extensionKey">
        <f:be.menus.actionMenuItemGroup label="{extensionKey}">
            <f:for each="{template}" as="currentTemplate" key="templateKey">
                <f:be.menus.actionMenuItem
                    controller="MyController" 
                    action="Index" 
                    arguments="{selectedTemplate: currentTemplate, selectedExtension: extensionKey}" 
                    label="{templateKey}" />
            </f:for>
        </f:be.menus.actionMenuItemGroup>
    </f:for>
</f:be.menus.actionMenu>

The ActionMenuItemGroupViewHelper is checking the class name of its child nodes and refuses to render the for-loop, because it is the child node and not of the ActionMenuItemViewHelper class.
I think it is totally viable to have this kind of structure to generate an actionMenu with option groups, though.