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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.

WPF TextBox not trimming in DataTemplate

I have an odd problem with TextBox with TextTrimming set to CharacterElipsis used in a DataTemplate in WPF application. At the start of application everything works fine. But when I am resizing the window - reducing the width, the trimming is not working.
In an example below:
<Grid>
<DockPanel>
<DockPanel.Resources>
<DataTemplate x:Key="lowerLevel" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="34*" />
<ColumnDefinition Width="26*" />
<ColumnDefinition Width="26*" />
<ColumnDefinition Width="14*" />
</Grid.ColumnDefinitions>
<TextBlock Text="textboxvalue1" Grid.Column="0" FontWeight="Bold" VerticalAlignment="Center" Margin="15,10,0,10" TextTrimming="CharacterEllipsis" TextWrapping="NoWrap" />
<TextBlock Text="textboxvalue2" Grid.Column="1" FontWeight="Bold" VerticalAlignment="Center" TextTrimming="CharacterEllipsis" TextWrapping="NoWrap" />
<TextBlock Text="textboxvalue3" Grid.Column="2" FontWeight="Bold" VerticalAlignment="Center" Margin="0,10,0,10" TextTrimming="CharacterEllipsis" TextWrapping="NoWrap" />
<CheckBox IsChecked="True" Content="ApprovedText" FontWeight="Bold" Grid.Column="3" VerticalAlignment="Center" Margin="0,10,15,10" />
</Grid>
</DataTemplate>
</DockPanel.Resources>
<ListView x:Name="listViewControl" ItemTemplate="{StaticResource lowerLevel}" VerticalAlignment="Stretch" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch" />
</DockPanel>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="34*" />
<ColumnDefinition Width="26*" />
<ColumnDefinition Width="26*" />
<ColumnDefinition Width="14*" />
</Grid.ColumnDefinitions>
<TextBlock Text="textboxvalue1" Grid.Column="0" FontWeight="Bold" VerticalAlignment="Center" Margin="15,10,0,10" TextTrimming="CharacterEllipsis" TextWrapping="NoWrap" />
<TextBlock Text="textboxvalue2" Grid.Column="1" FontWeight="Bold" VerticalAlignment="Center" TextTrimming="CharacterEllipsis" TextWrapping="NoWrap" />
<TextBlock Text="textboxvalue3" Grid.Column="2" FontWeight="Bold" VerticalAlignment="Center" Margin="0,10,0,10" TextTrimming="CharacterEllipsis" TextWrapping="NoWrap" />
<CheckBox IsChecked="True" Content="ApprovedText" FontWeight="Bold" Grid.Column="3" VerticalAlignment="Center" Margin="0,10,15,10" />
</Grid>
</Grid>
I am having two identical Grids, but first one is placed in a DataTemplate and the second is just a separate control. TextBoxes in bottom grid are trimming correctly, when resizing window, however the TextBoxes from DataTemplate do not fit the width of parent columns while window resizing.
The code behind is:
public partial class MainWindow : Window
{
private ListCollectionView comparedFamiliesView;
public ListCollectionView ComparedFamiliesView
{
get
{
if (comparedFamiliesView == null)
{
comparedFamiliesView = new ListCollectionView(new List<Object>() { new Object(), new Object(), new Object() });
}
return comparedFamiliesView;
}
}
public MainWindow()
{
InitializeComponent();
listViewControl.ItemsSource = ComparedFamiliesView;
}
}
It basically adds three objects to have something to view on ListView.
I was trying different combinations of VerticalAlignment, VerticalContentAlignment - didn't work.
What I have tried was to place each TextBox in separate Grid in order to bind its Width to TextBox Width or MaxWidth, like:
<Grid Grid.Column="0" x:Name="grid1">
<TextBlock Text="textboxvalue1" FontWeight="Bold" VerticalAlignment="Center" Margin="15,10,0,10" TextTrimming="CharacterEllipsis" TextWrapping="NoWrap" MaxWidth="{Binding ActualWidth, ElementName=grid1}" />
</Grid>
Didn't work either.
How can I force TextBoxes in DataTemplate to behave the same way as those in separate Grid?
Or what am I doing wrong with TextTrimming when using in DataTemplate.
Thank you for your help!!!
Regards,
Ariel

Try to set the ScrollViewer.HorizontalScrollBarVisibility attached property of the ListView to Disabled:
<ListView x:Name="listViewControl" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ...

Column in UWP DataTemplate not stretching

I'm writing a UWP app to track TV shows watched/purchased/streamed etc and
am going absolutely crazy trying to get grid columns inside a DataTempate to stretch their width as it seems there is a bug in XAML which ignores the * width definition. I need the first column in the ListView (the show Title) to take up the remaining space (hence the column definition = "*") and while it will do that in the HeaderTemplate it absolutely refuses to do it inside the DataTemplate so the whole grid just ends up being all wonky and out of alignment as the Title column only uses the space it needs on each line.
My XAML is below - in the ItemTemplate DataTemplate template I am binding to an instance of an object called TVShow which is in an observable collection in my main view model. (I have not included the ViewModel or TVShow class definition here as I know this is a purely XAML issue).
The only thing that worked so far is having an extra property in my TVShow class that stores the correct width of the column (by subtracting the widths of the other three columns from the grid size (fetched in the view code behind) but this causes the whole list to reformat itself after initally displaying which looks ugly, not to mention awful programming.
So I'm looking for ideas on how to solve this - I could move the property for the correct column width in the main viewmodel but then how do I bind to that in the template given I am binding to "TVShow"? Or do I have to take the content out of the DataTemplate and put in a UserControl? I have wasted so much time on something that is so ridiculously simple - this bug seems to have been around since WPF so why haven't MS ever fixed this - very frustrating.
<HubSection Name="hsShows" Width="{Binding HubSectionWidth}" MinWidth="430" MaxWidth="640"
VerticalAlignment="Top" HorizontalAlignment="Stretch" Background="{StaticResource Dark}" >
<HubSection.Header>
<TextBlock Text="Shows" TextLineBounds="TrimToBaseline" OpticalMarginAlignment="TrimSideBearings"
FontSize="24" Foreground="{StaticResource Light}"/>
</HubSection.Header>
<DataTemplate x:DataType="local:MainPage">
<ListView Name="lvwShows"
Width="{Binding HubSectionGridWidth}"
Grid.Row="0"
Foreground="{StaticResource Light}"
Background="{StaticResource Dark}"
Margin="-14,20,0,0"
Loaded="lvwShows_Loaded"
ItemsSource="{Binding AllShows}"
HorizontalAlignment="Stretch"
HorizontalContentAlignment="Stretch"
IsSwipeEnabled="True"
IsItemClickEnabled="True"
SelectedItem="{Binding SelectedTVShow, Mode=TwoWay}"
SelectionMode="Single"
ScrollViewer.VerticalScrollMode="Enabled"
ScrollViewer.VerticalScrollBarVisibility="Auto">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalAlignment" Value="Stretch" />
</Style>
</ListView.ItemContainerStyle>
<ListView.HeaderTemplate>
<DataTemplate>
<Grid Width="{Binding HubSectionGridWidth}" Height="Auto" Background="DarkGreen" Margin="15,5,5,5" HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="80"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="80"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="Title" FontSize="16" FontWeight="Bold" Foreground="{StaticResource Bright}"
VerticalAlignment="Bottom" HorizontalAlignment="Left"
Tag="TITLE,ASC" Tapped="ShowsGridHeading_Tapped"/>
<TextBlock Grid.Column="1" Text="Seasons" FontSize="16" FontWeight="Bold" Foreground="{StaticResource Bright}"
VerticalAlignment="Bottom" HorizontalAlignment="Center"
Tag="SEASONS,ASC" Tapped="ShowsGridHeading_Tapped"/>
<TextBlock Grid.Column="2" Text="Last Watched" FontSize="16" FontWeight="Bold" Foreground="{StaticResource Bright}"
VerticalAlignment="Bottom" HorizontalAlignment="Center" TextAlignment="Center" TextWrapping="Wrap"
Tag="WATCHED,ASC" Tapped="ShowsGridHeading_Tapped"/>
<TextBlock Grid.Column="3" Text="Last Episode" FontSize="16" FontWeight="Bold" Foreground="{StaticResource Bright}"
VerticalAlignment="Bottom" HorizontalAlignment="Center" TextAlignment="Center" TextWrapping="Wrap"
Tag="EPISODE,ASC" Tapped="ShowsGridHeading_Tapped"/>
</Grid>
</DataTemplate>
</ListView.HeaderTemplate>
<ListView.ItemTemplate>
<DataTemplate x:DataType="model:TVShow">
<Grid Height="Auto" MinWidth="410" MaxWidth="640" Background="Blue" HorizontalAlignment="Stretch" RightTapped="ShowsList_RightTapped">
<FlyoutBase.AttachedFlyout>
<MenuFlyout Placement="Bottom">
<MenuFlyoutItem x:Name="UpdateButton" Text="Update from TVMaze" Click="FlyoutUpdateButton_Click"/>
<MenuFlyoutItem x:Name="RefreshButton" Text="Refresh" Click="FlyoutRefreshButton_Click"/>
<MenuFlyoutItem x:Name="DeleteButton" Text="Delete Show" Click="FlyoutDeleteButton_Click"/>
</MenuFlyout>
</FlyoutBase.AttachedFlyout>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="80"/>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="80"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="{x:Bind Title}" Foreground="{StaticResource Light}"
VerticalAlignment="Center" HorizontalAlignment="Stretch" TextWrapping="Wrap" />
<TextBlock Grid.Row="0" Grid.Column="1" Text="{x:Bind Seasons}" Foreground="{StaticResource Light}"
VerticalAlignment="Center" HorizontalAlignment="Center"/>
<TextBlock Grid.Row="0" Grid.Column="2" Foreground="{StaticResource Light}"
Text="{x:Bind LastWatchedDate, Mode=OneWay, Converter={StaticResource DateTimeFormatConverter}, ConverterParameter='{}{0:dd/MM/yyy HH\\\\:mm}'}"
VerticalAlignment="Center" HorizontalAlignment="Center"/>
<TextBlock Grid.Row="0" Grid.Column="3" Text="{Binding LastWatchedEpisodeRef}" Foreground="{StaticResource Light}"
VerticalAlignment="Center" HorizontalAlignment="Center"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</DataTemplate>
</HubSection>

Ok, so I ended up adding this XAML into my ListViews (though I know I could have done what Grace suggested but I just find Blend horrific to use) - it was the HorizontalContentAlignment that actually did the trick!
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalAlignment" Value="Stretch" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ListView.ItemContainerStyle>

If you have Correct width in viewmodel you can Bind it like this
Width={Binding ElementName = ListViewname,Path=DataContext.width}

This problem is caused by the default template of the ListViewItem, to make the Grid stretch inside of the items, you can open the Document Outline label => find your ListView control and right click on it, then choose Edit Additional Templates => select Edit Generated Item Container (ItemContainerStyle), and at last Edit a Copy.
Then you will find this template in your Page resources, please change the code:
<Setter Property="HorizontalContentAlignment" Value="Left" />
To:
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
Then your problem can be solved.
I saw you've more then one ListView, if you want this style target all the ListView in this page, you can remove the x:Key attribute of this template and remove the ItemContainerStyle with the StaticResource which is generated by the action upper.
Don't be frustrating, I think you have developed WPF before, it's easy to learn UWP. Editing the template or the styles of the controls can solve many layout problem, here is some default templates and styles of different controls, you may take a look next time you have such problem.
If you have questions about how to develop an UWP app, you can refer to Develop UWP apps, and if you have some problems with the APIs, you may refer to Reference for Universal Windows apps.
If you need help or suggestion, you may ask question here, people here are glad to help.

How to change GridView.ItemTemplate while app is running?

In my app I have page with GridView and ComboBox. I want to change GridView.ItemTemplate property according to selected item in ComboBox. How should I implement it?
btw, I know about this question, but it is quite old and it does not look like "best practice". (How visibility/invisibility of ui control affects cpu/gpu load?)
My GridView:
<GridView x:Name="gridViewMain" Grid.Row="1" SelectionMode="None" IsItemClickEnabled="True"
ItemsSource="{Binding CurrentList}" ItemTemplate="{StaticResource gridViewMainItemTemplate}"
Loaded="gridViewMain_Loaded" LayoutUpdated="gridViewMain_LayoutUpdated">
<interactivity:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="ItemClick">
<core:CallMethodAction MethodName="GridViewClick"
TargetObject="{Binding Mode=OneWay}" />
</core:EventTriggerBehavior>
</interactivity:Interaction.Behaviors>
</GridView>
One of my templates:
<DataTemplate x:Key="gridViewMainItemTemplate">
<Grid x:Name="gridATemplate" Width="185" Height="288">
<Image x:Name="imgATemplate" Source="{Binding image_url}" Stretch="UniformToFill"
HorizontalAlignment="Center" VerticalAlignment="Center" />
<Grid Background="{ThemeResource ListViewItemOverlayBackgroundThemeBrush}" VerticalAlignment="Bottom">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<TextBlock x:Name="textBlockTitle" Text="{Binding title}"
TextWrapping="Wrap" Style="{StaticResource BodyTextBlockStyle}" Margin="5,0,0,0"
Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" Foreground="White" FontWeight="Bold"
MaxHeight="50" />
<TextBlock x:Name="textBlockType" TextWrapping="Wrap" Style="{StaticResource BodyTextBlockStyle}"
Margin="5,0,0,0"
Grid.Column="0" Grid.Row="1" Foreground="White" Text="{Binding type}" FontWeight="Bold" />
<StackPanel Grid.Row="1" Grid.Column="1" Orientation="Horizontal">
<TextBlock x:Name="textBlockProgressL" TextWrapping="Wrap"
Style="{StaticResource BodyTextBlockStyle}" FontWeight="Bold" Foreground="White"
Text="Progress:" />
<TextBlock x:Name="textBlockProgressV" TextWrapping="Wrap"
Style="{StaticResource BodyTextBlockStyle}" FontWeight="Bold" Foreground="White"
Text="{Binding watched_episodes}" Margin="10,0,0,10" />
</StackPanel>
</Grid>
</Grid>
</DataTemplate>

Sure you can do this! In XAML you can do anything. What you cannot do is change the Template on the fly without re-rendering. Remember, this is like telling your printer to use card stock. It will obey. If you change the setting to use notebook paper, it will obey that, too. You will just have to print again since it has already printed on card stock.
There are a few ways for you to re-render a GridView. One way is to navigate away from the page and navigate back. That's not ideal sounding in your scenario. Odds are, in your scenario, you just need to reset the ObservableCollection you are using. Like this:
void Reset<T>(ObservableCollection<T> collection)
{
var original = collection.ToArray();
collection.Clear();
foreach (var item in original)
collection.Add(item);
}
Best of luck!

You'll want to use datatemplateselector
http://blogs.msdn.com/b/bryanbolling/archive/2012/12/08/how-to-control-the-datatemplateselector-in-windows-store-apps.aspx
You can create multiple itemtemplates and choose which one to display based on any condition.
You'll have to refresh the gridview whenever the selection changes.

WPF Tab Control force Scrollviewer to display newly added item

I am using WPF MVVM with C#. I have a Scrollviewer in a UserControl and I need the following functionality that I haven't been able to work out how to do which is basically:
When an Item gets added to the content of my ScrollViewer; if the item added is not visible I would like my ScrollViewer to scroll down so that I can view my newly added Item in my ListView. I have been able to bind the selected item successfully but not sure how to make it scroll to it.
That's all there really is to it but I'm not sure how to do this. If there's any comments or questions I'll try to suitably amend the post, I've included the .xaml below
Thanks
<ScrollViewer Background="Pink" HorizontalAlignment="Left" Height="173" x:Name="ScrollViewer1" Width="560" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Hidden">
<Grid Name="GridValuesAndpartss" VerticalAlignment="Top" Height="165">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="370" />
<ColumnDefinition Width="204" />
</Grid.ColumnDefinitions>
<ListView SelectedItem="{Binding SelectedBetmyValue, Mode=TwoWay}" ItemsSource="{Binding Values}" Name="BetValuesListView" Height="Auto" Margin="0,0,0,0" myValueMode="Single" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<ListView.View>
<GridView>
<GridViewColumn Header="Price " Width="95">
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="-7,0,0,0" MinWidth="95" Width="Auto">
<TextBlock Text="{Binding Path=PriceTypeCode}" Foreground="Black" FontSize="10" ToolTip="Price Type Code" />
<TextBlock Text=":" Foreground="Black" FontSize="10" ToolTip="Price Type Code" />
<TextBlock Text="{Binding Path=PriceTaken,Converter={StaticResource myValuePriceDisplayConverter}}" Foreground="Red" FontSize="10" ToolTip="Price Taken" />
<TextBlock Text="." FontSize="4" />
<TextBlock Text="{Binding Path=PriceCurrent,Converter={StaticResource myValuePriceDisplayConverter}}" Foreground="Black" FontSize="10" ToolTip="Price # Scan Time" />
<TextBlock Text="." FontSize="4" />
<TextBlock Text="{Binding Path=PriceSP,Converter={StaticResource myValuePriceDisplayConverter}}" Foreground="Green" FontSize="10" ToolTip="Price SP" />
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
</ScrollViewer>

I would try to use here the code behind a little bit.
Give the ScrollViewer a name (like 'x:Name="MyScrolly"').
Listen to the 'SelectionChanged'-Event of ListView.
In the event handler of selection changed event (code behind) call:
MyScrolly.ScrollToBottom();
I think the new item is always at the bottom. If not try this method: 'ScrollToVerticalOffset()'.