Updated MessageBox (markdown)

MessageBox.md

@@ -94,6 +94,8 @@ You can style all instances of your MessageBox control by placing the style defi
 [[MessageBox_style_example.jpg]]
 
 ```
+        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
+
         <SolidColorBrush x:Key="MyButtonHoverBrush" Color="YellowGreen" />
         <SolidColorBrush x:Key="MyButtonPressedBrush" Color="Maroon" />
         
@@ -137,7 +139,7 @@ You can style all instances of your MessageBox control by placing the style defi
             </Setter>
         </Style>
         
-        <Style TargetType="{x:Type toolkit:MessageBox}">
+        <Style TargetType="{x:Type xctk:MessageBox}">
             <Setter Property="Background" Value="Aquamarine" />
             <Setter Property="BorderBrush" Value="Red" />
             <Setter Property="CaptionForeground" Value="Orange" />