Fix TextBox selection.

Perspex.Controls/TextBox.cs

@@ -112,20 +112,8 @@ namespace Perspex.Controls
         protected override void OnTemplateApplied()
         {
             this.presenter = this.GetTemplateChild<TextPresenter>("textPresenter");
-        }
+            this.presenter.GotFocus += PresenterGotFocus;
-
+            this.presenter.LostFocus += PresenterLostFocus;
-        protected override void OnGotFocus(GotFocusEventArgs e)
-        {
-            base.OnGotFocus(e);
-            this.presenter.ShowCaret();
-        }
-
-        protected override void OnLostFocus(RoutedEventArgs e)
-        {
-            base.OnLostFocus(e);
-            this.SelectionStart = 0;
-            this.SelectionEnd = 0;
-            this.presenter.HideCaret();
         }
 
         protected override void OnKeyDown(KeyEventArgs e)
@@ -451,5 +439,17 @@ namespace Perspex.Controls
 
             return i;
         }
+
+        private void PresenterGotFocus(object sender, RoutedEventArgs e)
+        {
+            this.presenter.ShowCaret();
+        }
+
+        private void PresenterLostFocus(object sender, RoutedEventArgs e)
+        {
+            this.SelectionStart = 0;
+            this.SelectionEnd = 0;
+            this.presenter.HideCaret();
+        }
     }
 }

Perspex.Themes.Default/TextBoxStyle.cs

@@ -60,7 +60,7 @@ namespace Perspex.Themes.Default
                         [~TextPresenter.CaretIndexProperty] = control[~TextBox.CaretIndexProperty],
                         [~TextPresenter.SelectionStartProperty] = control[~TextBox.SelectionStartProperty],
                         [~TextPresenter.SelectionEndProperty] = control[~TextBox.SelectionEndProperty],
-                        [~~TextPresenter.TextProperty] = control[~~TextBox.TextProperty],
+                        [~TextPresenter.TextProperty] = control[~TextBox.TextProperty],
                         [~TextPresenter.TextWrappingProperty] = control[~TextBox.TextWrappingProperty],
                     }
                 }