fixed scrolling issue

samples/NotificationFlyoutSample/Shell.xaml

@@ -16,7 +16,7 @@
             <MenuFlyoutItem Click="MenuFlyoutItem_Click" Text="Close" />
         </controls:NotificationFlyoutContextMenu>
     </controls:NotificationFlyout.ContextMenu>
-    <StackPanel Height="500" Margin="24">
+    <StackPanel Margin="24">
         <ComboBox
             x:Name="Theme"
             Margin="0,0,0,8"

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyout/NotificationFlyoutHost.xaml

@@ -13,6 +13,19 @@
                                 <Setter Property="Background" Value="Transparent" />
                                 <Setter Property="IsDefaultShadowEnabled" Value="False" />
                                 <Setter Property="Padding" Value="0" />
+                                <Setter Property="Template">
+                                    <Setter.Value>
+                                        <ControlTemplate TargetType="FlyoutPresenter">
+                                            <ContentPresenter
+                                                Margin="{TemplateBinding Padding}"
+                                                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
+                                                VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
+                                                Content="{TemplateBinding Content}"
+                                                ContentTemplate="{TemplateBinding ContentTemplate}"
+                                                ContentTransitions="{TemplateBinding ContentTransitions}" />
+                                        </ControlTemplate>
+                                    </Setter.Value>
+                                </Setter>
                             </Style>
                             <Style
                                 x:Key="TopFlyoutPresenterStyle"

src/NotificationFlyout.Uwp.UI.Controls/NotificationFlyout/NotificationFlyoutPresenter.xaml

@@ -33,6 +33,8 @@
         TintOpacity="0.8" />
     <Style TargetType="controls:NotificationFlyoutPresenter">
         <Setter Property="Background" Value="{ThemeResource NotificationFlyoutPresenterBackgroundBrush}" />
+        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
+        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="controls:NotificationFlyoutPresenter">