Non Aggregate Model Values in an Aggregate Template Header?

My grid:

    @( Html.Telerik().Grid<eGate.BackOffice.Core.Model.UI.EgateMenuRevisionViewData>()
        .Name("Grid")
    .Columns(columns =>
    {
        columns.Bound(c => c.ParentId)
            .Aggregate(a => a.Count()).ClientGroupHeaderTemplate(Html.ActionLink("Create a Revision for This Menu", "Edit", "Thing", new { menuid = "<#= Key #>" }, null).ToString());
        columns.Bound(c => c.ParentName);
        columns.Bound(c => c.ThingName);

    })

    .Groupable(grouping => grouping.Groups(groups => { 
        groups.Add(c => c.EgateMenu.EgateMenuId);
    }).Visible(false))

This works. But it gives me:

Create a revision for this menu
1 Parent 1 Thing 1.1
1 Parent 1 Thing 1.2
1 Parent 1 Thing 1.3
Create a revision for this menu
2 Parent 2 Thing 2.1
2 Parent 2 Thing 2.2
2 Parent 2 Thing 2.3

And while that works, I'd much rather something more intuitive like:

Create a thing for parent 1
Thing 1.1
Thing 1.2
Thing 1.3
Create a thing for parent 2
Thing 2.1
Thing 2.2
Thing 2.3

Problem 1: Create a thing for... needs to pass the ParentId to the actionlink but it needs to display the ParentName for the client yet only one exists in the aggregate at a time.

Problem 2: I want to group by the Id without displaying the Id column in the results. But setting the column to visible(false) supresses the clientgroupheadertemplate.

[Solved] Non Aggregate Model Values in an Aggregate Template Header?