Fixes compilation warnings

BookAStar/BookAStar/Views/ImageButton.cs

@@ -15,7 +15,8 @@ namespace BookAStar.Views
         /// Backing field for the Image property.
         /// </summary>
         public static readonly BindableProperty SourceProperty = BindableProperty.Create(
-            (Expression<Func<ImageButton, ImageSource>>)(w => w.Source),
+            "Source",
+            typeof(ImageSource), typeof(ImageButton), 
             null,
             BindingMode.OneWay,
             null,
@@ -24,8 +25,9 @@ namespace BookAStar.Views
         /// <summary>
         /// Backing field for the Image property.
         /// </summary>
-        public static readonly BindableProperty DisabledSourceProperty = BindableProperty.Create(
-            (Expression<Func<ImageButton, ImageSource>>)(w => w.DisabledSource),
+        public static readonly BindableProperty DisabledSourceProperty = 
+            BindableProperty.Create(
+            "DisabledSource", typeof(ImageSource), typeof(ImageButton), 
             null,
             BindingMode.OneWay,
             null,
@@ -35,36 +37,37 @@ namespace BookAStar.Views
         /// Backing field for the image width property.
         /// </summary>
         public static readonly BindableProperty ImageWidthRequestProperty =
-            BindableProperty.Create<ImageButton, int>(
-                p => p.ImageWidthRequest, default(int));
+            BindableProperty.Create("ImageWidthRequest",
+               typeof(int), typeof(ImageButton), default(int));
 
         /// <summary>
         /// Backing field for the image height property.
         /// </summary>
         public static readonly BindableProperty ImageHeightRequestProperty =
-            BindableProperty.Create<ImageButton, int>(
-                p => p.ImageHeightRequest, default(int));
+            BindableProperty.Create("ImageHeightRequest",
+                typeof(int), typeof(ImageButton), default(int));
 
         /// <summary>
         /// Backing field for the orientation property.
         /// </summary>
         public static readonly BindableProperty OrientationProperty =
-            BindableProperty.Create<ImageButton, ImageOrientation>(
-                p => p.Orientation, ImageOrientation.ImageToLeft);
+            BindableProperty.Create("Orientation", 
+                typeof(ImageOrientation), typeof(ImageButton), ImageOrientation.ImageToLeft);
 
         /// <summary>
         /// Backing field for the tint color property.
         /// </summary>
         public static readonly BindableProperty ImageTintColorProperty =
-            BindableProperty.Create<ImageButton, Color>(
-                p => p.ImageTintColor, Color.Transparent);
+            BindableProperty.Create("ImageTintColor", 
+                typeof(Color), typeof(ImageButton), Color.Transparent);
 
         /// <summary>
         /// Backing field for the disbaled tint color property.
         /// </summary>
         public static readonly BindableProperty DisabledImageTintColorProperty =
-            BindableProperty.Create<ImageButton, Color>(
-                p => p.DisabledImageTintColor, Color.Transparent);
+            BindableProperty.Create(
+                "DisabledImageTintColor",
+                typeof(Color), typeof(ImageButton), Color.Transparent);
 
         /// <summary>
         /// Gets or sets the ImageSource to use with the control.