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WrapPanel hides half of the last uiElement of each line

Each UserControl I have in a stackPanel has a WrapPanel, and each UserControl in this WrapPanel is a word (so they have a different size from each other, depending on the length of the word), so that a sentence appears.
Here is an image to help you understand better:
In pink it is the UserControl "sentence" that contain each of them ONE wrapPanel
In Green it is all the UserControl "word" that have all different size according to the word length.
Here is the UserControl "word":
<UserControl x:Class="Coran_seul.UC.UserControl_WordInVerse"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Coran_seul.UC"
mc:Ignorable="d" Margin="5,0,5,0">
<StackPanel>
<TextBlock x:Name="textBlock_arabic" Text="ٱلْأَنفَالُ " FontSize="20" HorizontalAlignment="Center" FontFamily="Noto Naskh Arabic" MouseEnter="textBlock_arabic_MouseEnter" MouseLeave="textBlock_arabic_MouseLeave" Cursor="Hand" MouseDown="textBlock_arabic_MouseDown"/>
<TextBlock x:Name="textBlock_french" Text="Les surplus (de bénéfice)" FontSize="20" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</StackPanel>
And here is the UserControl "sentence" (with the wrapPanel I have a problem with)
<UserControl x:Name="userControl" x:Class="Coran_seul.UC.UserControl_VerseInSurah"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Coran_seul.UC"
mc:Ignorable="d" Margin="0,5,0,5"
>
<Border x:Name="Border_Verse" >
<StackPanel Orientation="Horizontal" x:Name="grid">
<Label x:Name="Label_VersetNum" Content="2" Height="{Binding ActualHeight, ElementName=WrapPanel_Mots, Mode=OneWay}" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" VerticalAlignment="Stretch" HorizontalAlignment="Left" MouseDown="Label_VersetNum_MouseDown"/>
<WrapPanel x:Name="WrapPanel_Mots" Width="{Binding ActualWidth, ElementName=userControl, Mode=OneWay}" />
</StackPanel>
</Border>
The problem :
Now that I've entered the code, here's the problem I'm having with my wrapPanel:
The last word of each line does not wrap, even if it is larger than the space left (= it is therefore hidden/cut off at the edge of the wrapPanel)
Again I have a video to better explain the problem :
https://streamable.com/lpdf38
I don't know what it's due to and I'm desperately looking since yesterday not to have this problem anymore, knowing that the stackPanel containing all the userControls has a right margin of 20 so that it's not hidden behind the scrollbar.
Please help me to find a solution so that the word as long as it is hidden even by one pixel is wrapped to the next line.
Thank you,

The problem is that you bind the WrapPanel's Width to that of its UserControl parent without subtracting the Width of the Label element.
You should not need to bind any Width at all, when you use suitable Panel elements, like e.g. a Grid or a DockPanel instead of StackPanel.
<Border x:Name="Border_Verse">
<DockPanel>
<Label x:Name="Label_VersetNum" DockPanel.Dock="Left" .../>
<WrapPanel x:Name="WrapPanel_Mots">
</DockPanel>
</Border>
<Border x:Name="Border_Verse">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Label x:Name="Label_VersetNum" Grid.Column="0" .../>
<WrapPanel x:Name="WrapPanel_Mots" Grid.Column="1">
</DockPanel>
</Border>
You may also consider to use an ItemsControl to display a sentence. It would use a WrapPanel as its ItemsPanel and the word UserControl in its ItemTemplate:
<ItemsControl ItemsSource="{Binding Words}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<uc:UserControl_VerseInSurah/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
where Words is a collection of word data item objects in the view model, i.e. the object in the DataContext of the view. The two TextBlocks in the word UserControl would have their Text property bound to an appropriate property on the word data item class.
You may not even need the word UserControl at all, since you can simply move the elements from its XAML into the DataTemplate that is used as ItemTemplate.
See Data Templating Overview for details.

ScrollViewer not showing C#

I am new to C# and not fully understand ScrollViewer. Please see the code below and tell me why no Scroll bar becomes visible when below mentiond groupbox gets displayed on screen.
Any help would be highly appreciated.
<ScrollViewer ScrollViewer.VerticalScrollBarVisibility="Auto" Grid.Row="5">
<GroupBox Name="grpDetail" Margin="5" Height="Auto" Grid.Row="5" ScrollViewer.VerticalScrollBarVisibility="Visible">
<my2:ucDisbursmentDetail Grid.Row="5" x:Name="ucDisbursmentDetail" Visibility="Collapsed"></my2:ucDisbursmentDetail>
</GroupBox>
</ScrollViewer>

Your ScrollViewer is simply bigger than it's content therefore it doesn't need to show the scrollbar. Just add some height to it
<ScrollViewer Height="300">
...
</ScrollViewer>

ScrollBar Disabled

I was trying to implement a ScrollViewer like so;
<Height="auto" Width="auto"
MaxHeight="500" MaxWidth="400"
ResizeMode="NoResize" WindowStyle="None">
<Grid>
<StackPanel>
<ScrollViewer Name="scrlBr">
<StackPanel Orientation="Vertical">
<TextBlock Name ="txtBlock" Margin="10" Height="auto"
Width="auto" TextWrapping="Wrap"></TextBlock>
<Button Name="btnOk" Click="btnOk_Click" Width="80"
HorizontalAlignment="Center">Close!</Button>
</StackPanel>
</ScrollViewer>
<Label HorizontalAlignment="Center" FontSize="3"
Name="lblScrollDown">\/</Label>
</StackPanel>
</Grid>
</Window>
The problem I'm having is that the scroll bar appears disabled, while the text obviously goes down off the window and I can't see the btnOk. Surely if the window has a fixed height and the TextBlock and Button, which are contained in the Scrollviewer, are bigger than the window then the ScrollBar should be enabled, no?
UPDATE
I worked out that the problem lies in having the ScrollViewer within a StackPanel. Might try it with a Grid instead... Update to come.
SOLUTION
I was right about the Stackpanel being the problem and went with Heinzi's suggestion of using the DockPanel and all's workin' fine. :) Thanks!

The problem is your StackPanel. It always takes all the vertical space it needs, so the container of the ScrollPanel is much larger than the window itself, and the ScrollViewer sees no need to scroll.
Solution: Replace the StackPanel with a DockPanel. Move the <Label> declaration to the top and dock it to the bottom of the DockPanel. The last child in a DockPanel (which is the ScrollViewer in this case) always fills the remaining space:
<Grid>
<DockPanel>
<Label DockPanel.Dock="Bottom" ... Name="lblScrollDown">\/</Label>
<ScrollViewer Name="scrlBr">
...
</ScrollViewer>
</DockPanel>
</Grid>

Try setting the CanContentScroll property on True from the ScrollViewer and set a fixed height of the StackPanel, as a StackPanel is designed to grow indefinitely in one direction. Or better, use a different panel to stack your items in.

Maybe you need write something like this
<ScrollViewer Name="scrlBr" VerticalScrollBarVisibility="auto" HorizontalScrollBarVisibility="auto">
...
</ScrollViewer>

WPF Create a slide out panel

I don't know how this works technically but my requirement is as follows. I have a DataGrid and to input data into the DataGrid, I want a panel at the bottom of the DataGrid that slides out on a button click showing input options. Except, as the panel slides out, the DataGrid has to resize vertically as well. Can someone throw some light on how I can implement this?

You should be able to use a StackPanel with 2 children, your grid and your panel. Set the initial height of your panel to 0. Once the button is clicked, set the height to whatever you need it to be (e.g., MyPanel.Height = 20). You might want to wrap the grid in a ScrollViewer in case that is needed.
<StackPanel Orientation="Vertical">
<ScrollViewer Height="Auto" VerticalAlignment="Stretch">
<Grid Height="*" VerticalAlignment="Stretch" />
</ScrollViewer>
<ContentControl x:Name="MyPanel" Height="0" />
</StackPanel>
You might need to experiment with VerticalAlignment and Height="Auto" or Height="0" to get the layout you want.

You can use Expander. Please look at the following code snippet.
<DockPanel>
<Expander DockPanel.Dock="Bottom">
<StackPanel>
<TextBlock Height="25"></TextBlock>
<TextBlock Height="25"></TextBlock>
<TextBlock Height="25"></TextBlock>
</StackPanel>
</Expander>
<Border BorderBrush="LightGreen" BorderThickness="2">
<DataGrid/>
</Border>
</DockPanel >

Scroll bar, if Items exceed inside itemControl

I have ItemControl
It displays one panel for each record inside ObservableCollection.
My Problem is….
When size of ObservableCollection increase window can’t accommodate more panels so it displays only first six panels.
So criteria, One panel for each record inside ObservableCollection,couldn't be accomplish.
So, I need to have scroll bar so I can access each panel.
How does it can be implement?
See one screen shot below and Code of It Here
Thanks......

You need to host your panel within a ScrollViewer. This allows it to grow beyond the space available to it, whilst the ScrollViewer adds a Scrollbar.
You can do this by modiyfing the ItemsControl template:
<ItemsControl>
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer>
<ItemsPresenter/>
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
</ItemsControl>

Put any controls you want to have scrollbars into the ScrollViewer. Example taken from MSDN:
<ScrollViewer HorizontalScrollBarVisibility="Auto">
<StackPanel VerticalAlignment="Top" HorizontalAlignment="Left">
<TextBlock TextWrapping="Wrap" Margin="0,0,0,20">Scrolling is enabled when it is necessary.
Resize the window, making it larger and smaller.</TextBlock>
<Rectangle Fill="Red" Width="500" Height="500"></Rectangle>
</StackPanel>
</ScrollViewer>