AvaloniaTool/ZTools/Styles/CustomButton.cs

using Avalonia.Controls;
using Avalonia.Markup.Xaml;

namespace ZTools.Styles;

public class CustomButton : Button
{
    public CustomButton()
    {
        this.InitializeComponent();
    }

    private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
    }
}