Is the expander in a grouped DataGrid intentionally empty?

[marklam]

The row groupings in a DataGrid have a toggle button PART_ExpanderButton like the TreeViewItem does, but it doesn't have the icon or animation that the TreeViewItem does.

❓ Is this intentional? And if so, can it be styled from the app's own xaml?

I've created a branch with the outdated feature grid re-enabled (and grouped) on the Material.Avalonia.Demo's Home screen as an example:

[SKProCH]

Converted this into issue #432

But currently i doesn't have so much time to properly fix this, so i'm accepting PRs

[marklam]

@SKProCH I've made a PR which is basically a copy/paste of the TreeView version, but it seems to work.