Merge pull request #318 from negue/fix-visual-tree

fixes #317 - enabled live visual tree inside of Dialog/DrawerHost

Author: ButchersBoy

MaterialDesignThemes.Wpf/Themes/Generic.xaml

@@ -632,11 +632,12 @@
                                     x:Name="ContentPresenter" Opacity="1"                    
                                     Content="{TemplateBinding ContentControl.Content}" ContentTemplate="{TemplateBinding ContentControl.ContentTemplate}" ContentStringFormat="{TemplateBinding ContentControl.ContentStringFormat}" />
                         </AdornerDecorator>
-                        <Grid x:Name="PART_ContentCoverGrid" Background="Black" Opacity="0" IsHitTestVisible="False" Focusable="False" />
+                        <Grid x:Name="PART_ContentCoverGrid" Background="{x:Null}" Opacity="0" IsHitTestVisible="False" Focusable="False" />
                     </Grid>
                     <ControlTemplate.Triggers>
                         <Trigger Property="IsOpen" Value="True">
                             <Setter TargetName="ContentPresenter" Property="IsEnabled" Value="False" />
+                            <Setter TargetName="PART_ContentCoverGrid" Property="Background" Value="Black" />
                             <Setter TargetName="PART_ContentCoverGrid" Property="IsHitTestVisible" Value="True" />
                         </Trigger>
                     </ControlTemplate.Triggers>
@@ -645,6 +646,8 @@
         </Setter>
     </Style>
 
+    <SolidColorBrush x:Key="BlackBackground" Color="Black" />
+
     <Style TargetType="{x:Type local:DrawerHost}">
         <Setter Property="local:ShadowAssist.ShadowDepth" Value="Depth3" />
         <Setter Property="LeftDrawerBackground" Value="{DynamicResource MaterialDesignPaper}" />
@@ -672,6 +675,10 @@
                                                     </EasingDoubleKeyFrame.EasingFunction>
                                                 </EasingDoubleKeyFrame>
                                             </DoubleAnimationUsingKeyFrames>
+                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_ContentCover" 
+                                                                           Storyboard.TargetProperty="Background">
+                                                <DiscreteObjectKeyFrame Value="{StaticResource BlackBackground}" KeyTime="0" />
+                                            </ObjectAnimationUsingKeyFrames>
                                         </Storyboard>
                                     </VisualTransition>
                                     <VisualTransition From="AnyOpen" To="AllClosed">
@@ -697,6 +704,10 @@
                                         <BooleanAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="IsEnabled">
                                             <DiscreteBooleanKeyFrame Value="False" KeyTime="0" />
                                         </BooleanAnimationUsingKeyFrames>
+                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_ContentCover" 
+                                                                       Storyboard.TargetProperty="Background">
+                                            <DiscreteObjectKeyFrame Value="{StaticResource BlackBackground}" KeyTime="0" />
+                                        </ObjectAnimationUsingKeyFrames>
                                     </Storyboard>
                                 </VisualState>
                                 <VisualState x:Name="AllClosed">
@@ -760,7 +771,7 @@
                                     x:Name="ContentPresenter" Opacity="1"                    
                                     Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" ContentStringFormat="{TemplateBinding ContentStringFormat}" />
                         </AdornerDecorator>
-                        <Grid x:Name="PART_ContentCover" Background="Black" Opacity="0" IsHitTestVisible="False" Focusable="False" />
+                        <Grid x:Name="PART_ContentCover" Background="{x:Null}" Opacity="0" IsHitTestVisible="False" Focusable="False" />
                         <Grid HorizontalAlignment="Left" VerticalAlignment="Stretch">
                             <Grid.RenderTransform>
                                 <TranslateTransform x:Name="LeftDrawerTranslateTransform"