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C# WPF - Showing 15-20 User Controls with 4-6 TextBlocks each / Performance issues

I'm struggling with performance in my WPF application.
I have a ListView i populate with some buttons, which contain a bunch of TextBlocks with bindings.
I managed to get Virtualization going, so it seems the same whether its 20 or 2000 i load.
The problem is between 5 and 20. It simply appears that rendering a bunch of somewhat complicated User Controls, is simply too much for basic sub-par hardware.
This is how my Buttons/UserControls in my ListView looks ->
ListViewSample
I feel like WPF should be able to render this on sup-par hardware.
This is the xaml for the ListView:
<ListView ItemsSource="{Binding ButtonModels, IsAsync=True}"
Margin="0"
x:Name="ButtonsListView"
VirtualizingPanel.IsVirtualizing="True"
VirtualizingPanel.IsContainerVirtualizable="True"
VirtualizingPanel.VirtualizationMode="Recycling"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ScrollViewer.VerticalScrollBarVisibility="Auto"
SnapsToDevicePixels="True"
Background="Transparent"
BorderThickness="0">
<ListView.Resources>
<Style TargetType="ScrollBar">
<Setter Property="LayoutTransform">
<Setter.Value>
<ScaleTransform CenterX="0" CenterY="0"
ScaleX="3" ScaleY="3" />
</Setter.Value>
</Setter>
</Style>
</ListView.Resources>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<local:UniformGridPanel IsItemsHost="True" VerticalAlignment="Top" Height="Auto" Rows="4" Columns="{Binding Columns}" Margin="0">
</local:UniformGridPanel>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="Margin" Value="0"/>
<Setter Property="Padding" Value="0"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Button Height="117" Width="Auto"
Margin="6,0,6,0"
x:Name="MasterButton"
Click="MasterButton_Click"
Visibility="{Binding IsVisible, Converter={StaticResource BoolToVis}}"
Template="{StaticResource ProductButtonTemplate}"
Padding="0">
</Button>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListView.ItemContainerStyle>
</ListView>
Here is the xaml for the Button template:
<ControlTemplate TargetType="{x:Type Button}" x:Key="ProductButtonTemplate">
<UserControl>
<Grid Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="26"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Border Grid.Row="0" Background="{Binding HeaderBrush}" CornerRadius="3,3,0,0">
<TextBlock VerticalAlignment="Center" FontSize="12"
Text="{Binding DisplayName}"
Foreground="{Binding FontIsWhite, Converter={StaticResource BoolToFontColour}}"
FontFamily="{StaticResource DefaultRegular}"
Padding="8,0,0,0"/>
</Border>
<Border Grid.Row="1" Background="{StaticResource LightGrey}" CornerRadius="0,0,4,4" BorderBrush="{StaticResource BorderGrey}" BorderThickness="1">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="35" />
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0"
FontSize="12" TextTrimming="CharacterEllipsis" Text="Nr.:"
FontFamily="{StaticResource DefaultFont}"
VerticalAlignment="Center" HorizontalAlignment="Stretch"
Foreground="{StaticResource Black}"
Padding="8,0,0,0"/>
<TextBlock Grid.Row="1" Grid.Column="0"
FontSize="10" TextTrimming="CharacterEllipsis" Text="{Binding Combinations}"
FontFamily="{StaticResource DefaultFont}"
VerticalAlignment="Center" HorizontalAlignment="Stretch"
Foreground="{StaticResource Black}"
Padding="8,0,0,0"/>
<TextBlock Grid.Row="2" Grid.Column="0"
FontSize="10" TextTrimming="CharacterEllipsis" Text="{Binding SizeAndColour}"
FontFamily="{StaticResource DefaultFont}"
VerticalAlignment="Center" HorizontalAlignment="Stretch"
Foreground="{StaticResource Black}"
Padding="8,0,0,0"/>
<Grid Grid.Row="3" Grid.Column="0"
Width="24" Height="24"
VerticalAlignment="Center" HorizontalAlignment="Left"
Margin="8,0,0,0"
Visibility="{Binding ShowStockValue, Converter={StaticResource BoolToVis}}">
<Ellipse Fill="{Binding StockStatus, Converter={StaticResource EnumToBrush}}" Stroke="{StaticResource LightGrey}" StrokeThickness="0.1">
</Ellipse>
<TextBlock Text="{Binding Stock}"
Foreground="{StaticResource White}"
FontSize="9"
FontFamily="{StaticResource DefaultFont}"
VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Grid>
<TextBlock Grid.Row="0" Grid.Column="1"
FontSize="12" TextTrimming="CharacterEllipsis" Text="{Binding ProductNr}"
Foreground="{StaticResource Black}"
VerticalAlignment="Center" HorizontalAlignment="Right"
FontFamily="{StaticResource DefaultFont}"
Padding="0,0,8,0"/>
<Label Grid.Row="3" Grid.Column="1" FontSize="13"
Padding="0,0,8,8"
Content="{Binding Price}"
Foreground="{StaticResource Black}"
FontWeight="Bold"
FontFamily="{StaticResource DefaultFont}"
VerticalContentAlignment="Bottom" HorizontalContentAlignment="Right"
ContentStringFormat="{}{0:#,0.00}" />
</Grid>
</Border>
</Grid>
</UserControl>
</ControlTemplate>
tldr; I'm looking for performance tips on how to make this render faster. And this is BEFORE i reach a size in the ListView where my virtualization kicks in (Which works flawlessly)
Thanks in advance!

I managed to find a high performance solution - it just wasn't what i would expect to be better performing.
So instead of having one ListView with a binding, changing the data in the binding and repopulating the Listview, i just spawn a ListView for every collection i have.
It seems weird to me, that having a bunch of ListViews and just collapsing and showing them is more effcient, but it performs absolutely flawlessly.

Defining a border for ListView's item Template

Here is the XAML code for the ListView.
<ListView VerticalAlignment="Stretch"
HorizontalAlignment="Stretch"
x:Name="listView1">
<ListView.ItemTemplate>
<DataTemplate>
<Border HorizontalAlignment="Stretch"
BorderThickness="1"
BorderBrush="LightBlue">
<StackPanel Orientation="Vertical">
<Label BorderThickness="0,0,0,1"
BorderBrush="#BABABA"
HorizontalAlignment="Stretch">Keywords</Label>
<TextBlock Text="{Binding keywords}"
Foreground="#3399AA"
HorizontalAlignment="Stretch" />
<Label BorderThickness="0,0,0,1"
BorderBrush="#BABABA">Content</Label>
<TextBlock MaxHeight="50"
Text="{Binding contentAsString}"
TextWrapping="Wrap"
Foreground="Black"
Height="auto"
Width="auto" />
</StackPanel>
</Border>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
And here is how it looks
No matter what I've tried I couldn't create a border for the whole listview item. How can we do that?

Try with Stretch
<ListView>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListView.ItemContainerStyle>
</ListView>
. . .
<Viewbox Stretch="Fill"/>

Cannot select ListViewItem because a rectangle is in the way

I have a ListView bound to an ObservableCollection and when items are added to the ListView, if you hover over a ListViewItem, you will see that not only the ListViewItem itself if highlighted, but there is also another slightly-smaller, darker-blue rectangle that appears. Now this slightly smaller rectangle prevents you from being able to select the ListViewItem because it is on-top of the ListViewItem.
Why is it there and how do I get rid of it?
<Grid Margin="0, 25, 0, 22" Grid.Column="0">
<ScrollViewer ScrollViewer.CanContentScroll="True" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled">
<ListView x:Name="list" ItemsSource="{Binding Source=Message}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" BorderBrush="{x:Null}" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListView.ItemTemplate>
<DataTemplate>
<ListViewItem HorizontalAlignment="Stretch" Height="50">
<StackPanel Orientation="Vertical" HorizontalAlignment="Stretch">
<TextBlock Text="{Binding Sender}" HorizontalAlignment="Stretch" TextTrimming="WordEllipsis" TextWrapping="Wrap" FontWeight="SemiBold" />
<TextBlock Text="{Binding Subject}" HorizontalAlignment="Stretch" TextTrimming="WordEllipsis" TextWrapping="Wrap" />
</StackPanel>
</ListViewItem>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ScrollViewer>
</Grid>

You have a ListViewItem in your ListViewItem. The ListView will automatically wrap it's items in a container so you don't have to do that. Remove the ListViewItem from your DataTemplate.

Remove ListviewItem from DataTemplate. ListView will wrap whatever is in your DataTemplate in ListViewItem. If you have something to set against ListViewItem do it through ItemContainerStyle
<ListView x:Name="list" ItemsSource="{Binding Source=Message}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" BorderBrush="{x:Null}" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical" HorizontalAlignment="Stretch">
<TextBlock Text="{Binding Sender}" HorizontalAlignment="Stretch" TextTrimming="WordEllipsis" TextWrapping="Wrap" FontWeight="SemiBold" />
<TextBlock Text="{Binding Subject}" HorizontalAlignment="Stretch" TextTrimming="WordEllipsis" TextWrapping="Wrap" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="Height" Value="50"/>
</Style>
</ListView.ItemContainerStyle>
</ListView>

How Does This Grid App Template Scroll without a Scrollviewer? (C#/XAML Windows 8.1)

I've been trying to understand Scrollviewers, and thought I'd take a look at Microsoft's template for a Grid App for 8.1, whose content extends off the screen. What's odd is that there doesn't seem to even be a Scrollviewer in the XAML page. Can anyone tell me what is enabling the scrolling?
<Page
x:Name="pageRoot"
x:Class="GridApp.GroupedItemsPage"
DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:GridApp"
xmlns:data="using:GridApp.Data"
xmlns:common="using:GridApp.Common"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Page.Resources>
<x:String x:Key="ChevronGlyph"></x:String>
<!--
Collection of grouped items displayed by this page, bound to a subset
of the complete item list because items in groups cannot be virtualized
-->
<CollectionViewSource
x:Name="groupedItemsViewSource"
Source="{Binding Groups}"
IsSourceGrouped="true"
ItemsPath="Items"
d:Source="{Binding Groups, Source={d:DesignData Source=/DataModel/SampleData.json, Type=data:SampleDataSource}}"/>
</Page.Resources>
<!--
This grid acts as a root panel for the page that defines two rows:
* Row 0 contains the back button and page title
* Row 1 contains the rest of the page layout
-->
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid.ChildrenTransitions>
<TransitionCollection>
<EntranceThemeTransition/>
</TransitionCollection>
</Grid.ChildrenTransitions>
<Grid.RowDefinitions>
<RowDefinition Height="140"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!-- Horizontal scrolling grid -->
<GridView
x:Name="itemGridView"
AutomationProperties.AutomationId="ItemGridView"
AutomationProperties.Name="Grouped Items"
Grid.RowSpan="2"
Padding="116,137,40,46"
ItemsSource="{Binding Source={StaticResource groupedItemsViewSource}}"
SelectionMode="None"
IsSwipeEnabled="false"
IsItemClickEnabled="True"
ItemClick="ItemView_ItemClick">
<GridView.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Left" Width="250" Height="250">
<Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}">
<Image Source="{Binding ImagePath}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
</Border>
<StackPanel VerticalAlignment="Bottom" Background="{ThemeResource ListViewItemOverlayBackgroundThemeBrush}">
<TextBlock Text="{Binding Title}" Foreground="{ThemeResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextBlockStyle}" Height="60" Margin="15,0,15,0"/>
<TextBlock Text="{Binding Subtitle}" Foreground="{ThemeResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextBlockStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/>
</StackPanel>
</Grid>
</DataTemplate>
</GridView.ItemTemplate>
<GridView.ItemsPanel>
<ItemsPanelTemplate>
<ItemsWrapGrid GroupPadding="0,0,70,0"/>
</ItemsPanelTemplate>
</GridView.ItemsPanel>
<GridView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<Grid Margin="0,0,0,2">
<Button Foreground="{ThemeResource ApplicationHeaderForegroundThemeBrush}"
AutomationProperties.Name="Group Title"
Click="Header_Click"
Style="{StaticResource TextBlockButtonStyle}" >
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Title}" Margin="0,-11,10,10" Style="{StaticResource SubheaderTextBlockStyle}" TextWrapping="NoWrap" />
<TextBlock Text="{StaticResource ChevronGlyph}" FontFamily="Segoe UI Symbol" Margin="0,-11,0,10" Style="{StaticResource SubheaderTextBlockStyle}" TextWrapping="NoWrap" />
</StackPanel>
</Button>
</Grid>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</GridView.GroupStyle>
</GridView>
<!-- Back button and page title -->
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="120"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button x:Name="backButton" Margin="39,59,39,0" Command="{Binding NavigationHelper.GoBackCommand, ElementName=pageRoot}"
Style="{StaticResource NavigationBackButtonNormalStyle}"
VerticalAlignment="Top"
AutomationProperties.Name="Back"
AutomationProperties.AutomationId="BackButton"
AutomationProperties.ItemType="Navigation Button"/>
<TextBlock x:Name="pageTitle" Text="{StaticResource AppName}" Style="{StaticResource HeaderTextBlockStyle}" Grid.Column="1"
IsHitTestVisible="false" TextWrapping="NoWrap" VerticalAlignment="Bottom" Margin="0,0,30,40"/>
</Grid>
</Grid>

If we go check out the default GridView template and look for the ItemsPresenter we see it's embedded in a ScrollViewer at the template level. Since now we know there's one there, if we look up towards the top in the Setter declarations we've got some Properties available to us to interact with that ScrollViewer from the GridView itself by seeing;
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Disabled"/>
<Setter Property="ScrollViewer.HorizontalScrollMode" Value="Enabled" />
<Setter Property="ScrollViewer.IsHorizontalRailEnabled" Value="False" />
<Setter Property="ScrollViewer.VerticalScrollMode" Value="Disabled" />
<Setter Property="ScrollViewer.IsVerticalRailEnabled" Value="False" />
<Setter Property="ScrollViewer.ZoomMode" Value="Disabled" />
<Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False" />
<Setter Property="ScrollViewer.BringIntoViewOnFocusChange" Value="True" />
So if we wanted that GridView to not scroll anymore we could tell it not to like;
<GridView ScrollViewer.HorizontalScrollBarVisibility="Disabled"/>
since it's set to "Auto" at the template level by default.
That's the thing about templates, sometimes it just takes digging one level deeper. Hope this helps, cheers.

Listbox Separator in WPF and Omission of Final Separator

I have two things I'm trying to achieve:
Add a horizontal separator between listbox items in WPF.
Don't show the separator at the bottom of the final listbox item.
My current layout is pictured here:
This shows 2 listbox items (though I have no way of knowing how many items could potentially be generated). I would like them separated by a horizontal separator, except on the last listbox item so there isn't a spare separator at the bottom of the pane. How can I achieve this in XAML? See my current XAML here:
<TabItem Header="Third Party Updates">
<Grid>
<TextBlock Name="ThirdPartyNoManifestTextBox" Width="Auto" HorizontalAlignment="Left" Margin="267,22,0,0" TextWrapping="Wrap" Text="{Binding Path=WindowsUpdateCompliance, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Top" FontSize="14" Foreground="DarkSlateBlue"/>
<Button Name="CheckforThirdPartyUpdatesButton" Content="Check for Third Party Updates" Margin="10,11,339,304" Click="CheckforThirdPartyUpdatesButton_Click" MaxWidth="200" Grid.Column="1" Grid.Row="1"/>
<ListBox Name="ThirdPartyListBox" ItemsSource="{Binding}" Margin="0,70,0,0">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button Name="ThirdPartyInstallButton" Content="Install" Click="InstallThirdPartyUpdatesButton_Click" Margin="5,5,0,0" Height="25"></Button>
<Button Name="ThirdPartyPostoneButton" Content="Postpone" Click ="PostponeThirdPartyUpdatesButton_Click" Margin="5,5,0,0" Height="25"></Button>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Label Content="•" Grid.Row="1" VerticalContentAlignment="Center"/>
<Label Content="•" Grid.Row="2" VerticalContentAlignment="Center"/>
<Label Content="•" Grid.Row="3" VerticalContentAlignment="Center"/>
<Label Content="•" Grid.Row="4" VerticalContentAlignment="Center"/>
<StackPanel Orientation="Horizontal" Grid.Column="1">
<Label Name="MissingRequiredAppGenericTextBlock" VerticalAlignment="Center" Content="Required application update detected:" FontWeight="SemiBold" FontSize="12"/>
<Label Name="RequiredAppNameTextBlock" VerticalAlignment="Center" Content="{Binding Item2.Name}" Foreground="MidnightBlue" FontSize="13"/>
<Label Grid.Column="1" Grid.Row="1" Name="RequiredAppVersionTextBlock" Content="{Binding Item2.RequiredVersion}" VerticalAlignment="Center" Foreground="MidnightBlue" FontSize="13"/>
</StackPanel>
<TextBlock Grid.Column="1" Grid.Row="1" Name="RequiredAppCustomUIMessageTextBlock" Text="{Binding Item2.CustomUIMessage}" TextWrapping="Wrap" VerticalAlignment="Center"/>
<TextBlock Grid.Column="1" Grid.Row="2" VerticalAlignment="Center">
<Hyperlink Name="Link" NavigateUri="{Binding Item2.TT}" RequestNavigate="Hyperlink_RequestNavigate">
<TextBlock Text="{Binding Item2.TT}"/>
</Hyperlink>
</TextBlock>
<StackPanel Orientation="Horizontal" Grid.Column="1" Grid.Row="3">
<TextBlock Text="The following processes will be closed prior to install: " VerticalAlignment="Center" />
<TextBlock Text="{Binding Item2.ListOfProcessesToClose}" FontWeight="SemiBold" Foreground="Red" VerticalAlignment="Center"/>
</StackPanel>
<StackPanel Orientation="Horizontal" Grid.Column="1" Grid.Row="4">
<TextBlock Text="You have used " VerticalAlignment="Center" />
<TextBlock Text="{Binding Item3.UsedDeferrals}" VerticalAlignment="Center"/>
<TextBlock Text=" of " VerticalAlignment="Center"/>
<TextBlock Text="{Binding Item2.MaxDefferals}" VerticalAlignment="Center"/>
<TextBlock Text=" deferrals for this update." VerticalAlignment="Center"/>
</StackPanel>
</Grid>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Style.Triggers>
<DataTrigger Binding="{Binding PostponeClicked}" Value="1">
<Setter Property="Visibility" Value="Hidden"></Setter>
</DataTrigger>
<Trigger Property="Control.IsMouseOver" Value="True">
<Setter Property="Control.BorderBrush" Value="SteelBlue" />
<Setter Property="Control.BorderThickness" Value="1" />
</Trigger>
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
</Grid>
</TabItem>
Update
Added suggested separator code. Separator is now present but does not fill the available horizontal space:

You can try to put Separator at the top of each item. With that you don't have unwanted Separator after the last item.
Then use DataTrigger with {RelativeSource PreviousData} binding to hide separator at the top of the first item :
<StackPanel>
<Separator>
<Separator.Style>
<Style TargetType="Separator">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource PreviousData}}" Value="{x:Null}">
<Setter Property="Visibility" Value="Collapsed"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Separator.Style>
</Separator>
<StackPanel Orientation="Horizontal">
<Button Name="ThirdPartyInstallButton" Content="Install" Click="InstallThirdPartyUpdatesButton_Click" Margin="5,5,0,0" Height="25"></Button>
<Button Name="ThirdPartyPostoneButton" Content="Postpone" Click ="PostponeThirdPartyUpdatesButton_Click" Margin="5,5,0,0" Height="25"></Button>
<Grid>
.........
.........
</Grid>
</StackPanel>
</StackPanel>
UPDATE :
I can't tell for sure what causes the separator not stretching accross listbox width. Maybe try to set listboxitem's HorizontalContentAlignment to Stretch :
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListBox.ItemContainerStyle>