diff --git a/MapControl/Shared/AutoEquirectangularProjection.cs b/MapControl/Shared/AutoEquirectangularProjection.cs
index a40ee16f..dcb9e353 100644
--- a/MapControl/Shared/AutoEquirectangularProjection.cs
+++ b/MapControl/Shared/AutoEquirectangularProjection.cs
@@ -18,7 +18,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "AUTO2:42004";
 
-        public AutoEquirectangularProjection(string crsId = DefaultCrsId)
+        public AutoEquirectangularProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public AutoEquirectangularProjection(string crsId)
         {
             Type = MapProjectionType.NormalCylindrical;
             CrsId = crsId;
diff --git a/MapControl/Shared/AzimuthalEquidistantProjection.cs b/MapControl/Shared/AzimuthalEquidistantProjection.cs
index 9c98767a..76fef95a 100644
--- a/MapControl/Shared/AzimuthalEquidistantProjection.cs
+++ b/MapControl/Shared/AzimuthalEquidistantProjection.cs
@@ -17,7 +17,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "AUTO2:97003"; // proprietary CRS ID
 
-        public AzimuthalEquidistantProjection(string crsId = DefaultCrsId)
+        public AzimuthalEquidistantProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public AzimuthalEquidistantProjection(string crsId)
         {
             CrsId = crsId;
         }
diff --git a/MapControl/Shared/EquirectangularProjection.cs b/MapControl/Shared/EquirectangularProjection.cs
index b9fc24c9..be9ab1c0 100644
--- a/MapControl/Shared/EquirectangularProjection.cs
+++ b/MapControl/Shared/EquirectangularProjection.cs
@@ -19,7 +19,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "EPSG:4326";
 
-        public EquirectangularProjection(string crsId = DefaultCrsId)
+        public EquirectangularProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public EquirectangularProjection(string crsId)
         {
             Type = MapProjectionType.NormalCylindrical;
             CrsId = crsId;
diff --git a/MapControl/Shared/GnomonicProjection.cs b/MapControl/Shared/GnomonicProjection.cs
index 46952ed6..f851d84f 100644
--- a/MapControl/Shared/GnomonicProjection.cs
+++ b/MapControl/Shared/GnomonicProjection.cs
@@ -17,7 +17,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "AUTO2:97001"; // GeoServer non-standard CRS ID
 
-        public GnomonicProjection(string crsId = DefaultCrsId)
+        public GnomonicProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public GnomonicProjection(string crsId)
         {
             CrsId = crsId;
         }
diff --git a/MapControl/Shared/OrthographicProjection.cs b/MapControl/Shared/OrthographicProjection.cs
index 1caffe23..c93cfb16 100644
--- a/MapControl/Shared/OrthographicProjection.cs
+++ b/MapControl/Shared/OrthographicProjection.cs
@@ -17,7 +17,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "AUTO2:42003";
 
-        public OrthographicProjection(string crsId = DefaultCrsId)
+        public OrthographicProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public OrthographicProjection(string crsId)
         {
             CrsId = crsId;
         }
diff --git a/MapControl/Shared/PolarStereographicProjection.cs b/MapControl/Shared/PolarStereographicProjection.cs
index 2efe6301..4ad6ddd9 100644
--- a/MapControl/Shared/PolarStereographicProjection.cs
+++ b/MapControl/Shared/PolarStereographicProjection.cs
@@ -119,7 +119,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "EPSG:32661";
 
-        public UpsNorthProjection(string crsId = DefaultCrsId)
+        public UpsNorthProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public UpsNorthProjection(string crsId)
         {
             CrsId = crsId;
             IsNorth = true;
@@ -133,7 +139,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "EPSG:32761";
 
-        public UpsSouthProjection(string crsId = DefaultCrsId)
+        public UpsSouthProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public UpsSouthProjection(string crsId)
         {
             CrsId = crsId;
             IsNorth = false;
diff --git a/MapControl/Shared/StereographicProjection.cs b/MapControl/Shared/StereographicProjection.cs
index f7a216df..395bceb5 100644
--- a/MapControl/Shared/StereographicProjection.cs
+++ b/MapControl/Shared/StereographicProjection.cs
@@ -17,7 +17,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "AUTO2:97002"; // GeoServer non-standard CRS ID
 
-        public StereographicProjection(string crsId = DefaultCrsId)
+        public StereographicProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public StereographicProjection(string crsId)
         {
             CrsId = crsId;
         }
diff --git a/MapControl/Shared/WebMercatorProjection.cs b/MapControl/Shared/WebMercatorProjection.cs
index 50630446..a1476f0a 100644
--- a/MapControl/Shared/WebMercatorProjection.cs
+++ b/MapControl/Shared/WebMercatorProjection.cs
@@ -17,7 +17,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "EPSG:3857";
 
-        public WebMercatorProjection(string crsId = DefaultCrsId)
+        public WebMercatorProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public WebMercatorProjection(string crsId)
         {
             Type = MapProjectionType.WebMercator;
             CrsId = crsId;
diff --git a/MapControl/Shared/Wgs84UtmProjection.cs b/MapControl/Shared/Wgs84UtmProjection.cs
index f7d7a875..621e32bd 100644
--- a/MapControl/Shared/Wgs84UtmProjection.cs
+++ b/MapControl/Shared/Wgs84UtmProjection.cs
@@ -54,7 +54,13 @@ namespace MapControl
 
         private readonly string autoCrsId;
 
-        public Wgs84AutoUtmProjection(string crsId = DefaultCrsId)
+        public Wgs84AutoUtmProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public Wgs84AutoUtmProjection(string crsId)
             : base(31, true)
         {
             autoCrsId = crsId;
diff --git a/MapControl/Shared/WorldMercatorProjection.cs b/MapControl/Shared/WorldMercatorProjection.cs
index 118905d8..f0241c9d 100644
--- a/MapControl/Shared/WorldMercatorProjection.cs
+++ b/MapControl/Shared/WorldMercatorProjection.cs
@@ -17,7 +17,13 @@ namespace MapControl
     {
         public const string DefaultCrsId = "EPSG:3395";
 
-        public WorldMercatorProjection(string crsId = DefaultCrsId)
+        public WorldMercatorProjection()
+            : this(DefaultCrsId)
+        {
+            // XAML needs parameterless constructor
+        }
+
+        public WorldMercatorProjection(string crsId)
         {
             Type = MapProjectionType.NormalCylindrical;
             CrsId = crsId;