First commit of the new XAML Map Control that replaces WPF Map Control, and now supports all three XAML platforms, WPF, Silverlight and WinRT.

SampleApps/WpfApplication/LocationToVisibilityConverter.cs

@@ -0,0 +1,36 @@
+using MapControl;
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+using System.Windows.Media;
+
+namespace WpfApplication
+{
+    public class LocationToVisibilityConverter : IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            Visibility visibility = Visibility.Hidden;
+
+            if (values.Length == 2 && values[0] is Map && values[1] is Transform)
+            {
+                Map parentMap = (Map)values[0];
+                Matrix transform = ((Transform)values[1]).Value;
+
+                if (transform.OffsetX >= 0d && transform.OffsetX <= parentMap.ActualWidth &&
+                    transform.OffsetY >= 0d && transform.OffsetY <= parentMap.ActualHeight)
+                {
+                    visibility = Visibility.Visible;
+                }
+            }
+
+            return visibility;
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
+}