[Solved] How to add a column menu item to tabbed component?

[Boardy]

In a grid I'm setting up the column menu with the tabbed component style. I would like to add a menu to the second tab.

In the documentation, I found Column Menu mentioning the ColumnMenuInit event. I was able to set up this event and it gets triggered when first opening the menu for a field. But I cannot locate the kendoMenu with

let menu = e.container.find(".k-menu").data("kendoMenu");

I could locate the panels through

let tab = e.container.find("[role=tabpanel]");

but my quest stranded there.

The grid is something like this

 @(Html.Kendo().Grid<DashboardViewModel>()
     .Name("dashboard")
     .Columns(...)
     .Events(e => e.ColumnMenuInit("menuInit"))
     .ColumnMenu(menu =>
     {
          menu.ComponentType("tabbed");
          menu.ClearAllFilters();
          menu.AutoSize();
     })
     ...
)

So how can I accomplish adding a menu to the second tab?

Thanks in advance