Fixed issue where FlyoutAssist could not be used from XAML

Author: mgnslndh

MahMaterialDragablzMashUp/MainWindow.xaml

@@ -6,6 +6,7 @@
                       xmlns:mahMaterialDragablzMashUp="clr-namespace:MahMaterialDragablzMashUp"
                       xmlns:dockablz="clr-namespace:Dragablz.Dockablz;assembly=Dragablz"
                       xmlns:wpf="http://materialdesigninxaml.net/winfx/xaml/themes"
+                      
                       WindowTransitionsEnabled="False"
                       TextElement.Foreground="{DynamicResource MaterialDesignBody}"
                       Background="{DynamicResource MaterialDesignPaper}"					  
@@ -14,7 +15,7 @@
                       Title="Material-MahApps-Dragablz Mash Up" Height="640" Width="800">
     <controls:MetroWindow.Flyouts>
         <controls:FlyoutsControl>
-            <controls:Flyout x:Name="LeftFlyout" Position="Left" Header="Settings">
+            <controls:Flyout x:Name="LeftFlyout" Position="Left" Header="Settings" wpf:FlyoutAssist.HeaderColorMode="Accent">
                 <mahMaterialDragablzMashUp:FlyoutContent />
             </controls:Flyout>
         </controls:FlyoutsControl>

MaterialDesignThemes.MahApps/Properties/AssemblyInfo.cs

@@ -3,6 +3,7 @@
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Windows;
+using System.Windows.Markup;
 
 // General Information about an assembly is controlled through the following 
 // set of attributes. Change these attribute values to modify the information
@@ -53,3 +54,4 @@
 // [assembly: AssemblyVersion("1.0.*")]
 [assembly: AssemblyVersion("0.0.6")]
 [assembly: AssemblyFileVersion("0.0.6")]
+[assembly: XmlnsDefinition("http://materialdesigninxaml.net/winfx/xaml/themes", "MaterialDesignThemes.MahApps")]