如何设置从 Button 继承的对象的样式？

有一个类：

public class GLine : Button
{
    public int x, y;
    Game game;
    public GLine(int x, int y)
    {
        this.x = x;
        this.y = y;
        Grid.SetRow(this, y);
        Grid.SetColumn(this, x);
        DataContextChanged += GLine_DataContextChanged;
    }

    private void GLine_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        game = (Game)DataContext;
        Click += game.PlayerClick;
    }
}

如何使用放置该对象的 UserControl 的标记中描述的样式设置此类的对象？

TargetType = "Button" - 不起作用。