Can't get TextBlock to fill the ComboBoxItem in Avalonia

Question

The ItemTemplate for my ComboBox is like this:

new FuncDataTemplate(
    typeof(object),
    (item, _) => new TextBlock
    {
        HorizontalAlignment = HorizontalAlignment.Stretch,
        Text = "Hello",
    })

Yet despite the horizontal alignment being set to stretch, the TextBlock doesn't fill the ComboBoxItem.

zacoons · Accepted Answer · 2025-11-17 01:44:29Z

4

This was because ComboBoxItem.HorizontalContentAlignment is set to Left by default. The issue can be fixed by applying a global style such as:

new Style(s => s.Is<ComboBoxItem>())
{
    Setters =
    {
        new Setter(ComboBoxItem.HorizontalContentAlignmentProperty, HorizontalAlignment.Stretch),
    },
});

answered Nov 17 at 1:44

zacoons

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