Fix focus adorners a bit.

Perspex.Themes.Default/ButtonStyle.cs

@@ -7,8 +7,10 @@
 namespace Perspex.Themes.Default
 {
     using System.Linq;
+    using Perspex.Collections;
     using Perspex.Controls;
     using Perspex.Controls.Presenters;
+    using Perspex.Controls.Shapes;
     using Perspex.Layout;
     using Perspex.Media;
     using Perspex.Styling;
@@ -23,6 +25,7 @@ namespace Perspex.Themes.Default
                 {
                     Setters = new[]
                     {
+                        new Setter(Button.FocusAdornerProperty, new AdornerTemplate(FocusAdornerTemplate)),
                         new Setter(Button.TemplateProperty, ControlTemplate.Create<Button>(this.Template)),
                         new Setter(Button.HorizontalContentAlignmentProperty, HorizontalAlignment.Center),
                         new Setter(Button.VerticalContentAlignmentProperty, VerticalAlignment.Center),
@@ -70,6 +73,17 @@ namespace Perspex.Themes.Default
             });
         }
 
+        public static Control FocusAdornerTemplate()
+        {
+            return new Rectangle
+            {
+                Stroke = Brushes.Black,
+                StrokeThickness = 1,
+                StrokeDashArray = new PerspexList<double>(1, 2),
+                Margin = new Thickness(3.5),
+            };
+        }
+
         private Control Template(Button control)
         {
             Border border = new Border

Perspex.Themes.Default/DefaultTheme.cs

@@ -12,11 +12,12 @@ namespace Perspex.Themes.Default
     {
         public DefaultTheme()
         {
+            this.Add(new FocusAdornerStyle());
+
             this.Add(new ButtonStyle());
             this.Add(new CheckBoxStyle());
             this.Add(new ContentControlStyle());
             this.Add(new DropDownStyle());
-            this.Add(new FocusAdornerStyle());
             this.Add(new GridSplitterStyle());
             this.Add(new ItemsControlStyle());
             this.Add(new ListBoxStyle());

Perspex.Themes.Default/FocusAdornerStyle.cs

@@ -35,7 +35,6 @@ namespace Perspex.Themes.Default
                 Stroke = Brushes.Black,
                 StrokeThickness = 1,
                 StrokeDashArray = new PerspexList<double>(1, 2),
-                Margin = new Thickness(3),
             };
         }
     }

Perspex.Themes.Default/TextBoxStyle.cs

@@ -27,6 +27,7 @@ namespace Perspex.Themes.Default
                         new Setter(TextBox.TemplateProperty, ControlTemplate.Create<TextBox>(this.Template)),
                         new Setter(TextBox.BorderBrushProperty, new SolidColorBrush(0xff707070)),
                         new Setter(TextBox.BorderThicknessProperty, 2.0),
+                        new Setter(TextBox.FocusAdornerProperty, null),
                     },
                 },
                 new Style(x => x.OfType<TextBox>().Class(":focus").Template().Id("border"))

Perspex.Themes.Default/ToggleButtonStyle.cs

@@ -28,6 +28,7 @@ namespace Perspex.Themes.Default
                         new Setter(ToggleButton.BackgroundProperty, new SolidColorBrush(0xffdddddd)),
                         new Setter(ToggleButton.BorderBrushProperty, new SolidColorBrush(0xff707070)),
                         new Setter(ToggleButton.BorderThicknessProperty, 2.0),
+                        new Setter(ToggleButton.FocusAdornerProperty, new AdornerTemplate(ButtonStyle.FocusAdornerTemplate)),
                         new Setter(ToggleButton.ForegroundProperty, new SolidColorBrush(0xff000000)),
                         new Setter(ToggleButton.HorizontalContentAlignmentProperty, HorizontalAlignment.Center),
                         new Setter(ToggleButton.VerticalContentAlignmentProperty, VerticalAlignment.Center),