XAML-Map-Control/MapControl/WinUI/MapContentControl.WinUI.cs

#if UWP
using Windows.UI.Xaml;
using Windows.UI.Xaml.Data;
#else
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Data;
#endif

namespace MapControl;

public partial class MapContentControl
{
    public MapContentControl()
    {
        DefaultStyleKey = typeof(MapContentControl);
        MapPanel.InitMapElement(this);
    }

    protected override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        var parentMap = MapPanel.GetParentMap(this);

        if (parentMap != null)
        {
            // Workaround for missing RelativeSource AncestorType=MapBase Bindings in default Style.
            //
            if (Background == null)
            {
                SetBinding(BackgroundProperty,
                    new Binding { Source = parentMap, Path = new PropertyPath(nameof(Background)) });
            }
            if (Foreground == null)
            {
                SetBinding(ForegroundProperty,
                    new Binding { Source = parentMap, Path = new PropertyPath(nameof(Foreground)) });
            }
            if (BorderBrush == null)
            {
                SetBinding(BorderBrushProperty,
                    new Binding { Source = parentMap, Path = new PropertyPath(nameof(Foreground)) });
            }
        }
    }
}

public partial class Pushpin
{
    public Pushpin()
    {
        DefaultStyleKey = typeof(Pushpin);
    }
}