Adding children/child to a button?

Is it possible to add children or a single child to a button? For example to create buttons like those in the sidebar of this app:

So, ideally I’d do something like this:

Button.create [
    Button.child [
        StackPanel.create [ (* ... *) ]
    ]
    Button.fontSize 20.0
    // ...
]

Is that possible or is there another way to achieve this sort of thing?

[JaggerJo]

@smolck Using HorizontalAlignment = Stretch should work when a control doesn’t fill the available space by default.

(most panels fill the available space by default if you don’t set other constraints)

There is a good section about this in the docs.

https://avaloniaui.net/docs/layout/alignment-margins-padding

[FoggyFinder]

@smolck you can use ItemsControl/ListBox for that case and change right panel depending on click / selection

Also, for Grid you could use instead

Grid.columnDefinitions "Auto,*, Auto"