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How to add a separator to the Expander component in UWP app?

I'm looking for a way of implementing this kind of separator to the expander component in UWP app:
Any ideas how to do that?
I've managed to create the similar look of the expander, but I don't know how to implement separators?
Also, I would like to learn how to make expanders kind of "push" other components down when I expand them, so they don't overlap with other components, but simply move them.
Here's the XAML code for this expander:
<muxc:Expander x:Name="FontExpander"
x:Uid="FontExpander"
Width="1155"
IsExpanded="True"
Margin="22,323,0,0"
VerticalAlignment="Top"
Grid.Row="2"
Height="380"
HorizontalContentAlignment="Left"
ExpandDirection="Down">
<muxc:Expander.Header>
<Grid HorizontalAlignment="Stretch" VerticalAlignment="Center">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<FontIcon Margin="0,0,12,0"
VerticalAlignment="Center"
Foreground="{ThemeResource TextFillColorPrimaryBrush}"
FontSize="16"
Glyph=""/>
<StackPanel Grid.Column="1"
Margin="0,12"
Orientation="Vertical">
<TextBlock x:Uid="SettingsFontTitle" Style="{StaticResource BodyTextBlockStyle}"/>
<TextBlock x:Uid="SettingsFontDescription"
Style="{StaticResource CaptionTextBlockStyle}"
Foreground="{ThemeResource TextFillColorSecondaryBrush}"
TextWrapping="WrapWholeWords"/>
</StackPanel>
</Grid>
</muxc:Expander.Header>
<muxc:Expander.Content>
<Grid Margin="-18,-170,-17,-170">
<TextBlock x:Name="SettingsFamily" x:Uid="SettingsFamily" Text="Family" Margin="50,51,1000,286"/>
<ComboBox x:Name="ComboBoxFamily" ItemsSource="{x:Bind Fonts}" Width="200" Margin="950,41,0,0" SelectionChanged="ComboBoxFamily_SelectionChanged" />
<TextBlock x:Name="SettingsStyle" x:Uid="SettingsStyle" Text="Style" Margin="50,106,995,218" Loaded="SettingsStyle_Loaded"/>
<ComboBox x:Name="ComboBoxStyle" Width="200" Margin="950,101,0,0">
<x:String>Regular</x:String>
</ComboBox>
<TextBlock x:Name="SettingsSize" x:Uid="SettingsSize" Text="Size" Margin="50,166,1002,158"/>
<ComboBox x:Name="ComboBoxSize" ItemsSource="{x:Bind FontSizes}" Width="200" Margin="950,161,0,0"/>
<TextBlock x:Name="Text" x:Uid="SettingsText" Text="Hello World! I am so excited to be here!" Margin="62,224,38,126" TextWrapping="Wrap" FontSize="{x:Bind (x:Double)ComboBoxSize.SelectedValue, Mode=OneWay}" TextAlignment="Center"/>
</Grid>
</muxc:Expander.Content>
</muxc:Expander>
Any help would be much appreciated!

A separate can for example be implemented using a Border or a Grid:
<Grid Background="DarkGray" Height="1" />
As a side note, you shouldn't use margins to position your elements. Use an appropriate layout Panel. Using a Grid, you should add ColumnDefinitions and RowDefinitions to it as examplified here.

C# UWP buttons not align the way I wanted

I have created a button next to my "Start" button. In my xaml page, the button appears at where I want it to be.
However, when I run the app, it appears at a random location.
how do I fix this ?
StackPanel>
<TextBlock Text="Description:" Style="{StaticResource SampleHeaderTextStyle}"/>
<TextBlock Style="{StaticResource ScenarioDescriptionTextStyle}" Text="This page is where your exercise starts " FontSize="20"/>
<TextBlock TextWrapping="Wrap" Margin="0,20,0,0" FontSize="20">
Follow the instruction and press "Start" to begin the exercise.
</TextBlock>
<TextBlock TextWrapping="Wrap" Margin="0,0,0,0" FontSize="15">
(Ensure the connected BLE device is working before starting the exercise.)
</TextBlock>
<TextBlock x:Name="txtClock" TextWrapping="Wrap" Margin="0,10,0,0" FontSize="20"/>
<Button x:Name="btnStart" Content="Start" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,10,0,0" Height="38" Width="106" Click="btnStart_Click_1"/>
<TextBlock x:Name="txtExercise" TextWrapping="Wrap" Margin="0,10,0,0" FontSize="15"/>
<TextBlock x:Name="txtAngle" TextWrapping="Wrap" Margin="0,10,0,0" FontSize="15"/>
<TextBlock x:Name="txtDisplay" TextWrapping="Wrap" Margin="0,10,0,0"/>
<TextBlock x:Name="txtAgain" Text="" TextWrapping="Wrap" Margin="0,10,0,0" FontSize="15"/>
<Button x:Name="btnRefresh" Content="Refresh" HorizontalAlignment="Left" VerticalAlignment="Top" Height="38" Width="106" Margin="150,-158,0,0" Click="btnRefresh_Click"/>

Since you are using the Margin-Property of the button it makes sense that it will pop up somewhere else.
To be honest I don't really know why but I had the same problems.
I would advise you to either use a RelativePanel a StackPanel or a Grid.
You can have a read on this microsoft page. To find out more about the difference between the various types.
A grid would look something like this:
(Keep in mind a grid is 0 indexed)
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="100"/> //For a Row of 100 units height
<RowDefinition Height="*"/> //For a Row which fills the rest of the available screen space
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/> //For a column of 100 units width
<ColumnDefinition Width="*"/> //For a column which fills the rest of the screen
</Grid.ColumnDefinitions>
<Button x:Name="Button1" Grid.Row="0" Grid.Column="0" />
<Button x:Name="Button2" Grid.Row="1" Grid.Column="1" />
</Grid>
A Stackpanel would look like this:
(A thing to keep in mind here is that a Stackpanel will not resize its elements when the screen/window size changes)
<Stackpanel Orientation="horizontal">
<Button x:Name="Button1"/>
<Button x:Name="Button2"/>
</Stackpanel>

UWP XAML Button with image and text in a Hub [duplicate]

This question already has an answer here:
How do I place a text over a image in a button in WinRT
(1 answer)
Closed 5 years ago.
I am learning different ways of achieving certain layouts with XAML in UWP (I know I'm late to the party but I just started with the UWP stuff!)
What I am trying to achieve is a main navigation page kind of thing from a hub control on my main page. At every HubSection, I will have button on each column of a 2-column grid, which will contain buttons. Ive'tried something similar to this post but the debugger kept failing to attach to my UWP app when I used images instead of textblocks.
Essentially, what I've got until now is something like this: (I've shared my code down below)
But what I am trying to achieve is each button having its own image background and a separate TextBlock with semi-transparent background at the bottom centre of the button... (I've only photo shopped it, this is the thing I am trying to achieve...)
So this is what I've tried so far... I've also tried the relative panel but no luck...
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200" />
<ColumnDefinition Width="200" />
</Grid.ColumnDefinitions>
<StackPanel Orientation="Vertical" Grid.Column="0" Margin="10,10,10,0">
<Button HorizontalAlignment="Stretch">
<Grid>
<TextBlock HorizontalAlignment="Center">Column 0 Item 1</TextBlock>
<Image Source="/Assets/Artwork/150x150/RobCos_Worst_Nightmare_trophy.jpg" Stretch="None" />
</Grid>
<StackPanel>
<TextBlock>Column 0 Item 1</TextBlock>
<Image Source="/Assets/Artwork/150x150/RobCos_Worst_Nightmare_trophy.jpg" Stretch="None" />
</StackPanel>
</Grid>
My complete code looks something like this for this page.
<Page
x:Class="VaultManager.Terminal.Views.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Black">
<Hub SectionHeaderClick="Hub_SectionHeaderClick">
<Hub.Header>
<Grid Margin="0,20,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="80"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="pageTitle" Text="My Hub Sample" Style="{StaticResource SubheaderTextBlockStyle}" Grid.Column="1" IsHitTestVisible="false" TextWrapping="NoWrap" VerticalAlignment="Top"/>
</Grid>
</Hub.Header>
<HubSection Header="Overview">
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200" />
<ColumnDefinition Width="200" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="150" />
</Grid.RowDefinitions>
<StackPanel Orientation="Vertical" Grid.Column="0" Margin="10,10,10,0">
<Button HorizontalAlignment="Stretch">
<StackPanel>
<TextBlock>Column 0 Item 1</TextBlock>
<Image Source="/Assets/Artwork/150x150/RobCos_Worst_Nightmare_trophy.jpg" Stretch="None" />
</StackPanel>
</Button>
<Button HorizontalAlignment="Stretch" >
<RelativePanel>
<TextBlock>Column 0 Item 2</TextBlock>
<Image Source="/Assets/Artwork/150x150/RobCos_Worst_Nightmare_trophy.jpg" Stretch="None" />
</RelativePanel>
</Button>
</StackPanel>
<StackPanel Orientation="Vertical" Grid.Column="1" Margin="10,10,10,10">
<Button HorizontalAlignment="Stretch">
<StackPanel>
<TextBlock>Column 1 Item 1</TextBlock>
<Image Source="/Assets/Artwork/150x150/RobCos_Worst_Nightmare_trophy.jpg" Stretch="None" />
</StackPanel>
</Button>
<Button HorizontalAlignment="Stretch" >
<StackPanel>
<TextBlock>Column 1 Item 2</TextBlock>
<Image Source="/Assets/Artwork/150x150/RobCos_Worst_Nightmare_trophy.jpg" Stretch="None" />
</StackPanel>
</Button>
</StackPanel>
</Grid>
</DataTemplate>
</HubSection>
<HubSection Header="Videos" Name="Videos">
<!-- yada yada -->
</HubSection>
<HubSection Header="Audios" Name="Audios">
<!-- blah blah -->
</HubSection>
</Hub>
</Grid>

Good job giving us all that info. You may want to take a look here since the asker in that question seems to have had a similar issue. The answerer suggested using a Grid instead of a StackPanel. Hope that helps. After that, you should be able to adjust the transparency of the text. If you are using visual studio you can just click on the text element and adjust the background brush from the Properties tab. The button w/ the image should look like this:
<Button HorizontalAlignment="Stretch">
<Grid>
<TextBlock Text = "Column 0 Item 1">
<TextBlock.Background>
<SolidColorBrush Color="(**Colour here**)" Opacity = "(**Opacity Here {1 being opaque and 0 being transparent}**)/>
</TextBlock.Background></TextBlock>
<Image Source="/Assets/Artwork/150x150/RobCos_Worst_Nightmare_trophy.jpg" Stretch="None" />
</Grid>
</Button>

Stackpanel: Black background on wp8

I have one problem - my stackpanel is vey big and it breaks(background color is changed to black).. What should i do to improve it?
<Grid x:Name="LayoutRoot" Background="#FF2D2D2D" >
<Grid.RowDefinitions>
<RowDefinition Height="60"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel x:Name="TitlePanel" Orientation="Horizontal" Grid.Row="0">
..
</StackPanel>
<ScrollViewer Name="viewer" Grid.Row="1" >
<StackPanel Name="ContentGrid" Canvas.ZIndex="1" Margin="0, 0,0,80" Background="White" Width="452">
<Image Name="ImageImage" Height="300" VerticalAlignment="Top"/>
<TextBlock Name="DateText" TextWrapping="Wrap" TextAlignment="Center" FontSize="18" Foreground="Black"/>
<TextBlock Name="TitleText" TextWrapping="Wrap" FontSize="20" TextAlignment="Center" Foreground="Black" Margin="10,0"/>
<TextBlock TextWrapping="Wrap" Margin="10,15,10,2" Name="DescroptionText" FontSize="23" Foreground="#FF494949" FontFamily="Portable User Interface"/>
<TextBlock TextWrapping="Wrap" TextTrimming="WordEllipsis" Margin="10,0,10,2" Name="DescroptionText2" FontSize="23" Foreground="#FF494949"/>
<ListBox SelectionChanged="GridImages_SelectionChanged" ScrollViewer.VerticalScrollBarVisibility="Disabled" Name="GridImages" ItemTemplate="{StaticResource AttachmentsItemTemlate}" Grid.RowSpan="2" FontFamily="Portable User Interface" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel Orientation="Horizontal" FlowDirection="LeftToRight" ItemWidth="150" ItemHeight="150"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</StackPanel>
</ScrollViewer>
</Grid>

There is a limitation of 2048px in Windows Phone UIElements.
You should try to break your different elements into smaller elements (for example: you could put several stackpanels inside the first one).
In TextBox elements there is a workaround explained here.

Best this is to make the Main Window to white background and Make your stackpanel as transparent background instead of giving any color to it. It works great as I have tested it.

Try this code, but first you need to add windows toolkit library.
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
<toolkit:PhoneTextBox
TextWrapping="Wrap"
Name="txtString"
ScrollViewer.VerticalScrollBarVisibility="Visible"
MaxHeight="200"
PlaceholderText="Add text"
Padding="5"
Width="370"
FontFamily="Open Sans Light"
FontSize="22"
Height="Auto" ///Use Auto or provide height value
Margin="10"
/>
This code is used for Scrolling as well work for Auto Growing Textbox. If you don't want Auto Growing Textbox then provide height instead of Auto in Height attribute.

Windows Phone 8 - TextBlock in StackPanel not wrapping Text properly?

I have an app that is based on the Panorama control. Clicking on an item on one of the Panorama control's pages (tabs) goes to a details page. On that details page I have the XAML below that renders the item content. As you can see there is a TextBlock hosted by a StackPanel in the phone:PanoramaItem.Header element. I want the text in that element to wrap the video title the TextBlock is bound to in the view model. I have TextWrapping set to wrap and I have assigned it a fixed width so the TextBlock doesn't grow/expand (and therefore won't wrap). The text does wrap, but some lines still appear clipped with some words appearing "cut off". What is wrong with my XAML?
I read about using a DockPanel instead:
TextBlock Wrapping in WPF Layout
But this app has a StackPanel used on a lot of different pages so if I can stick with a StackPanel I'd prefer it.
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid Grid.Row="0" Visibility="{Binding IsInternetAvailable}" Background="{StaticResource PhoneAccentBrush}" Height="30">
<TextBlock Text="{Binding Path=LocalizedResources.NoConnection, Source={StaticResource LocalizedStrings}}" Margin="10, 0"/>
</Grid>
<phone:Panorama x:Name="PanoramaFavorites_DetailVideos" Grid.Row="2" Foreground="{StaticResource CustomApplicationTextBrush}" Background="{StaticResource CustomApplicationBackgroundImage}" SelectionChanged="panoramaFavorites_DetailVideos_SelectionChanged">
<phone:Panorama.Title>
<StackPanel Orientation="Horizontal" Margin="0,15,0,0">
<Image Height="85" Width="85" Source="http://appstudiodata.blob.core.windows.net/apps/1383/db936107-bce6-41a2-9d95-1d342f66c6bb/res/Logo-b3883645-a6cd-4cc8-82be-97c87a266656.png" Stretch="Uniform" VerticalAlignment="Bottom" HorizontalAlignment="Left" Margin="5,0,10,5" RenderTransformOrigin="0.5,0.5" />
<TextBlock FontSize="92" Text="Robot Videos" FontFamily="Segoe WP Light" Foreground="{StaticResource CustomTitleApplicationTextBrush}" VerticalAlignment="Stretch"/>
</StackPanel>
</phone:Panorama.Title>
<phone:PanoramaItem x:Name="PanoramaFavorites_DetailVideos0" Margin="0,0,0,25">
<phone:PanoramaItem.Header>
<StackPanel Orientation="Horizontal" Margin="0,7,0,0">
<TextBlock Text="{Binding CurrentYouTubeVideo.Title, Converter={StaticResource SanitizeString}}" Foreground="{StaticResource CustomApplicationTextBrush}" FontSize="36" TextWrapping="Wrap" Width="440" Height="170"/>
</StackPanel>
</phone:PanoramaItem.Header>
<ctl:FlipControl NextElementCommand="{Binding NextpanoramaFavorites_DetailVideos0}" PreviousElementCommand="{Binding PreviouspanoramaFavorites_DetailVideos0}" ShowPreviousButton="{Binding HasPreviouspanoramaFavorites_DetailVideos0}" ShowNextButton="{Binding HasNextpanoramaFavorites_DetailVideos0}">
<ctl:FlipControl.InnerContent>
<Grid Margin="10,5,5,5">
<ScrollViewer>
<ctl:YouTubePlayer Margin="0,10" MaxHeight="250" VerticalAlignment="Top" VideoId="{Binding CurrentYouTubeVideo.VideoId, TargetNullValue={StaticResource DefaultNoImageValue}}"/>
</ScrollViewer>
</Grid>
</ctl:FlipControl.InnerContent>
</ctl:FlipControl>
</phone:PanoramaItem>
</phone:Panorama>
</Grid>

As per your comments, this works for me:
<StackPanel Orientation="Vertical" Margin="0,7,0,0">
<TextBlock Text="{Binding CurrentYouTubeVideo.Title, Converter={StaticResource SanitizeString}}"
Foreground="{StaticResource CustomApplicationTextBrush}"
FontSize="36"
TextWrapping="Wrap"
MaxWidth="440"/>
</StackPanel>