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WPF : adding a Button as "Show More" where on click of it would load remaining items in the itemControl which is already in Binding a Collection

I am bit new to WPF (XAML) and I have an ItemsControl bound to a list with a MyCollections property . Now my requirement is initially to show only 1st element from the list and having a Show More button option at the end of list. A click on it would show the rest of the items from the collection.
This is my XAML so far, displaying the whole collection:
<ItemsControl x:Name="ContentRoot" ItemsSource="{Binding MyCollections}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<grid>
<TextBox Text="{Binding }" />
<TextBox Text="{Binding }" />
</grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

You can have both a ContentControl (which displays the first item of the collection) and an ItemsControl (which displays the whole collection) displayed only when a ToggleButton is checked for example.
<StackPanel>
<StackPanel.Resources>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
<DataTemplate DataType="{x:Type local:MyViewModel}">
<Grid>
<TextBox Text="{Binding}" />
</Grid>
</DataTemplate>
</StackPanel.Resources>
<ContentControl Content="{Binding MyCollection[0]}"/>
<ToggleButton x:Name="toggle" Content="Show more"/>
<ItemsControl ItemsSource="{Binding MyCollection}" Visibility="{Binding ElementName=toggle, Path=IsChecked, Converter={StaticResource BooleanToVisibilityConverter}}"/>
</StackPanel>
You can then adapt this to fit your exact needs.

UWP: ListView ItemClick not work

I have to do a Master/Detail in UWP
1- If you're in Laptop:
The responsible GridView of show the data of this person appear.
So when you select a item is binded to ViewModel.
<ScrollViewer x:Name="ScrollLista" Grid.Column="0" Grid.Row="1">
<ListView x:Name="Lista" ItemsSource="{Binding Lista}" ItemClick="Lista_ItemClick" SelectedItem="{Binding PersonaSeleccionada, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding nombre}" />
<TextBlock Text="{Binding apellido}" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</ScrollViewer>
<Grid x:Name="CRUD" Grid.Column="1" Grid.Row="1" DataContext="{Binding PersonaSeleccionada}" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
...
</Grid>
2- When is a mobile:
Only will appear the list and when I select a item this should be two things.
Call to ViewModel by binding using SelectedItem.
Call to code behind using ItemClick, this will be in charge of calling another page.
The problem: ItemClick not working, not call to Lista_ItemClick... How can I call a method and send the item selected to code behind?

For click event to work, IsItemClickEnabled="True" should be added to the ListView.

Get TabItem Name in UserControl

I have the following code that creates a TabControl. Each tab contains a UserControl (code is below) that displays different data (one shows Local tax info and the other show Fed/State tax info).
TabControl
<TabControl
Name="MappingTabs"
Margin="6,7,7,8" Padding="6"
Background="White" >
<TabItem
Name="LocalTaxTab"
Padding="6,1"
Header="Local">
<AdornerDecorator>
<DockPanel>
<Border Margin="7">
<GroupBox
Name="LocalTaxesGroup">
<GroupBox.Header>
<TextBlock
FontWeight="Bold"
Text="Local Taxes">
</TextBlock>
</GroupBox.Header>
<StackPanel Margin="20,8,10,0"
Orientation="Vertical">
<local:TaxCodeMappingHeader />
<!-- Note that a row is 25 high, -->
<ScrollViewer
MaxHeight="250"
>
<ItemsControl
Name="LocalTaxCodeMappingControl"
ItemTemplate="{StaticResource MappingRuleTemplate}"
BorderThickness="0"
AlternationCount="2"
IsTextSearchEnabled="False"
HorizontalContentAlignment="Stretch"
ItemsSource="{Binding TaxCodesCollection[0].CodeCollection, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}">
<!-- ItemsSource="{Binding Source={StaticResource sortedCodeCollection}}"> -->
</ItemsControl>
</ScrollViewer>
<local:TaxCodeMappingFooter DataContext="{Binding RelativeSource={RelativeSource AncestorType=UserControl}}"/>
</StackPanel>
</GroupBox>
</Border>
</DockPanel>
</AdornerDecorator>
</TabItem>
<TabItem
Name="FedStateTaxesTab"
Padding="6,1"
Header="Federal\State">
<AdornerDecorator>
<DockPanel>
<Border Margin="7">
<GroupBox
Name="FedStateTaxesGroup">
<GroupBox.Header>
<TextBlock
FontWeight="Bold"
Text="Federal \ State Taxes">
</TextBlock>
</GroupBox.Header>
<StackPanel Margin="20,8,10,0"
Orientation="Vertical">
<local:TaxCodeMappingHeader />
<!-- Note that a row is 25 high, -->
<ScrollViewer
MaxHeight="250"
>
<ItemsControl
Name="FedStateTaxCodeMappingControl"
ItemTemplate="{StaticResource MappingRuleTemplate}"
BorderThickness="0"
AlternationCount="2"
IsTextSearchEnabled="False"
HorizontalContentAlignment="Stretch"
ItemsSource="{Binding TaxCodesCollection[1].CodeCollection, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}">
<!-- ItemsSource="{Binding Source={StaticResource sortedCodeCollection}}"> -->
</ItemsControl>
</ScrollViewer>
<local:TaxCodeMappingFooter DataContext="{Binding RelativeSource={RelativeSource AncestorType=UserControl}}"/>
</StackPanel>
</GroupBox>
</Border>
</DockPanel>
</AdornerDecorator>
</TabItem>
</TabControl>
</StackPanel>
UserControl (TaxCodeMappingFooter)
<Button
Name="AddButton"
Grid.Row="0"
Grid.Column="0"
Height="20" Width="20"
Command="{Binding Path=DataContext.AddClickCommand}"
CommandParameter="(want the tab name here)"
Style="{StaticResource ImageButton}"
ToolTip="Add a rule"
local:AttachedImage.Image="{StaticResource AddImageSource}" />
The UserControl (TaxCodeMappingFooter) contains an Add button that I need to wire up via RelayCommand to the VM. I need to somehow tell the VM which tab is calling the Add command so that an item can be added to the correct collection. I thought about sending the TabName and then keying off that to know which tab the user is on.
Is my idea correct or is the a better way to do this and if it is correct how do I get the TabName value to pass it back as a CommandParameter?

If you are going to hard code your UI controls as you have done, then perhaps your simplest option is to define a string DependencyProperty in your TaxCodeMappingFooter control:
public static readonly DependencyProperty TabNameProperty = DependencyProperty.
Register("TabName", typeof(string), typeof(TaxCodeMappingFooter));
public string TabName
{
get { return (string)GetTabName(TabNameProperty); }
set { SetTabName(TabNameProperty, value); }
}
Then you could set it from your TabItems:
<local:TaxCodeMappingFooter TabName="FedStateTaxesTab" DataContext="{Binding
RelativeSource={RelativeSource AncestorType=UserControl}}" />
And Bind to it from inside your control:
<Button Name="AddButton" Command="{Binding Path=DataContext.AddClickCommand}"
CommandParameter="{Binding TabName, RelativeSource={RelativeSource
AncestorType=TaxCodeMappingFooter}}" ... />

As others have said, if you model your view model structure appropriately, this would not be much of an issue.
If you really want to bind against an ancestor element, you can use a RelativeSource of FindAncestor, then specify the AncestorType. Note that you may need to tweak AncestorLevel if you are the descendant of more than one TabItem.
{Binding Path=Name
RelativeSource={RelativeSource Mode=FindAncestor,
AncestorType={x:Type TabItem}}}
(wrapping added for clarity)

Windows Store App - XAML UI element not visible in C# code

I have the following XAML code and the only element available in the C# code behind are the Grid and the FlipView. How can I make the ScrollViewer, Image or the Viewbox visibile in the code?
XAML:
<Grid x:Name="gridViewPages">
<FlipView x:Name="FlipView1" Loaded="FlipView1_Loaded" Style="{StaticResource FlipViewPreviewIndicator}" Tapped="FlipView1_Tapped">
<FlipView.ItemTemplate>
<DataTemplate>
<ScrollViewer x:Name="pagesScrollViewer" ZoomMode="Enabled"
HorizontalAlignment="Center"
VerticalAlignment="Center"
HorizontalScrollBarVisibility="Hidden"
VerticalScrollBarVisibility="Hidden"
MinZoomFactor="1.0"
MaxZoomFactor="3.0"
Margin="0"
Width="1500" DoubleTapped="PagesScrollViewer_DoubleTapped">
<Viewbox x:Name="pagesViewbox">
<Image Source="{Binding}"
Height="730"
x:Name="pageImage" Stretch="Uniform" Loaded="MainImage_Loaded"/>
</Viewbox>
</ScrollViewer>
</DataTemplate>
</FlipView.ItemTemplate>
</FlipView>
</Grid>
The flipview is customized and contains also a listview defined in which is not visible in the code too...:
<Page.Resources>
...
<ListView x:Name="pagesPreview" HorizontalAlignment="Center" Height="100" VerticalAlignment="Bottom" Width="Auto"
ItemsSource="{TemplateBinding ItemsSource}"
SelectedItem="{Binding SelectedItem, Mode=TwoWay, RelativeSource={RelativeSource Mode=TemplatedParent}}"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
ScrollViewer.VerticalScrollBarVisibility="Disabled"
ScrollViewer.HorizontalScrollMode="Enabled"
ScrollViewer.VerticalScrollMode="Disabled"
Background="AliceBlue"
Opacity="1"
SelectionChanged="pagesPreview_SelectionChanged"
Visibility="Visible">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Center" VerticalAlignment="Center">
<Image Source="{Binding}" Stretch="UniformToFill"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
...
</Page.Resources>

See the basic concept of the flipview is to have multiple pages to have a flip effect. So whatever the Data template contains is repeated multiple times. So if you want the x:Name to come up then you wont have any success.
There are two ways As per my knowledge :
VisualTreeHelper -> for a better detail of it go through this link
Get elements from data template
you can manually iterate over the flipview elements and track down the children of the flipview. Try that in debug mode you'll get a fair idea of what comes after what. Just keep track of the element at which selected index position you want modified
Thanks.

ListBox does not use all available space within Grid.Column - WPF

I have a ListBox control that has been assigned to Grid.Column 0 which has a value of '*' defined for it's width, however when rendered there is a sizeable amount of space that is not being used.
I have also noticed that there is a border of sorts around the ListBox control itself, however I have not added one within the markup.
My UI (Areas of concern marked in Red):
My Markup:
<Window.Resources>
<DataTemplate x:Key="GameImagesTemplate" >
<StackPanel Orientation="Vertical">
<Image Source="{Binding FileInfo.FullName}" Margin="8,8,8,8" Height="70" Width="70" />
<Label Content="{Binding Name}" Width="70" />
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="GameTemplate">
<StackPanel>
<Label Content="{Binding Name}" Background="Gray" FontSize="16" />
<ListBox x:Name="imageContent" ItemsSource="{Binding FileList}" ItemTemplate="{StaticResource GameImagesTemplate}" ScrollViewer.HorizontalScrollBarVisibility="Disabled" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" IsItemsHost="True" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</StackPanel>
</DataTemplate>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ListBox x:Name="ContentList" ItemTemplate="{StaticResource GameTemplate}" Grid.Column="0" ScrollViewer.HorizontalScrollBarVisibility="Disabled" />
<StackPanel Grid.Column="1" Background="DarkGray">
<Button Click="OnLoad">_Load</Button>
<Button Click="OnSave">_Save</Button>
<Button Click="OnAdd">_Add</Button>
<Button Click="OnDelete">_Delete</Button>
</StackPanel>
</Grid>
How would I go about resolving both of the issues raised. Is it the default behaviour of the ListBox control?
Many thanks

Yes, that is the default behavior.
In the case of the alignment it looks like you have a WrapPanel in each ListBoxItem which doesn't have quite enough space to put another item on line 1. The remaining space is unused because of the HorizontalContentAlignment setting on ListBox defaulting to Left. This setting is in turn bound to by the default ListBoxItem. Setting HorizontalContentAlignment="Stretch" on your ListBox should fix that.
The outer border comes from the default setting for BorderBrush and BorderThickness. Setting BorderThickness="0" will get rid of it entirely.
There are some other default Padding settings that add some spacing in the default Styles and Templates. If you want to get more into those add a ListBox to a project in Blend and make a copy of its default Template and ItemContainerStyle and check out the XAML. Also consider using the base ItemsControl in cases where you don't need selection behavior, as it doesn't have any of these type of default settings.