Develop Reference

how to give height of a parent to child in UWP

I have a stack panel and it has one grid and I'd like the grid to have same height as stack panel.
I tried playing with VerticalAlignment stretch or height 100% nothing works
I tried setting the values programatically OnNavigatedTo but it doesn't have the effect
Any suggestions to resolve this are welcome
Please find the code below
<StackPanel Grid.Row="0" Grid.RowSpan="4" Background="#CFFF" Visibility="Visible" Orientation="Vertical" Name="ProgressOverlay">
<Grid Name="Overlaygrid"">
<StackPanel VerticalAlignment="Center" Grid.Row="0">
<ProgressBar
IsIndeterminate="True"
IsEnabled="True" Foreground="Black"/>
<TextBlock Visibility="Visible" Foreground="Black" FontSize="25” T HorizontalAlignment="Center" Text="Loading"/>
</StackPanel>
</Grid>
</StackPanel>

A StackPanel takes by default the size needed by its content and shrinks to the size required, while a container control like Grid stretches to the full size available (e.g full page).
If you want to keep the outer StackPanel, you will have to set VerticalAlignment="Stretch" on the StackPanel, not on the Grid.
But since the Grid is the only single content item in your outer StackPanel, you can remove it and move the properties Grid.RowSpan="4" Background="#CFFF" Visibility="Visible" to the Grid. Always try to keep your XAML structure as simple as possible.

WPF Textblock With Bound Text Will Not Scroll

The text in my TextBlock is bound to an element in my code. However, when I first open my window, the Textblock is completely empty. As I add text, I need the ScrollViewer to allow me to scroll down the text, or automatically scroll down as more text is added. Using the MVVM, so no code behind would be ideal.
<StackPanel Grid.Column="0" Grid.Row="1" Margin="0 10">
<Label Style="{StaticResource LabelStyle}">Output</Label>
<ScrollViewer VerticalScrollBarVisibility="Visible" Height="100">
<TextBlock ScrollViewer.CanContentScroll="True" Height="100" VerticalAlignment="Stretch" TextWrapping="Wrap" Text="{Binding Path=ProcessingOutput}"/>
</ScrollViewer>
</StackPanel>
How can I make this happen? Is there a way to update the ScrollViewer so that it sees more text is beyond what I can see in the TextBlock and allows the user to scroll down, or allows me to set an autoscroll feature that scrolls down automatically as text is added via binding?
Thanks in advance!

scrollbar will work if you remove Height="100" from TextBlock
to make it scroll when Text changes other answers suggest to use ScrollViwer.ScrollToBottom() method, e.g. like this:
<ScrollViewer Name="scroll"
VerticalScrollBarVisibility="Visible"
Height="100">
<TextBlock ScrollViewer.CanContentScroll="True"
VerticalAlignment="Stretch"
TextWrapping="Wrap"
Text="{Binding Path=ProcessingOutput, NotifyOnTargetUpdated=True}"
TargetUpdated="Txt_OnTargetUpdated">
</TextBlock>
</ScrollViewer>
private void Txt_OnTargetUpdated(object sender, DataTransferEventArgs e)
{
scroll.ScrollToBottom();
}

XAML WP8 and making a 'TextBlock' scroll down

Alright, so I have a XAML page with a TextBlock in a Windows Phone 8 application. My dilemma is this:
I pragmatically add more content (formatted lines with Inlines.Add(new Run...) to the TextBlock. The text block is currently filled from bottom to up because of the ScrollViewer in the sense that a line appears in the bottom after another. I would also be fine with them starting to appear from the top as long as the TextBlock would continue to scroll down (actually this might look better) once it is full. My TextBlock is inside a ScrollViewer as below:
<Popup x:Name="send_message_xaml" Grid.Row="1" VerticalOffset="0" Width="750" Height="auto">
<StackPanel Orientation="Vertical" Margin="0,0" Width="auto" Height="auto">
<ScrollViewer Height="345" HorizontalAlignment="Left" Margin="0,0,0,0" Name="scrollViewer1" VerticalAlignment="Bottom" Width="420" VerticalScrollBarVisibility="Auto">
<TextBlock x:Name="message_log" Margin="40,50,0,0" TextWrapping="Wrap" Width="420" VerticalAlignment="Top" FontSize="22"/>
</ScrollViewer>
<TextBox x:Name="message_to_send" InputScope="Chat" Width="480" KeyDown="message_to_send_KeyDown" Margin="15,0"/>
</StackPanel>
</Popup>
How can I get the textblock to scroll so that the newest appended message is always at the bottom? I found a bunch of these threads but none seem to solve my problem so far. Do I need to add some code somewhere with the appending?

You need to update the VerticalOffset based on the ScrollableHeight. When you add new inlines to the TextBlock, its height is going to change and that will notify the parent ScrollViewer. So, after you add new items to the inlines, run the Measure method and update the VerticalOffset.
Here is an example.

Inline object position in XAML WP8

I want to make checkbox and textbloxk parallel or inline in my XAML WP8, but it seems the checkbox is upside and the textblock is below the checkbox. Any suggest how?
<Grid Margin="0,522,0,0" VerticalAlignment="Top" HorizontalAlignment="Left">
<StackPanel HorizontalAlignment="Center">
<CheckBox x:Name="Accept"/>
<TextBlock Text="I Accept Terms and Conditions" VerticalAlignment="Top"/>
</StackPanel>
</Grid>

You don't need TextBlock for this. Set CheckBox.Content:
<CheckBox x:Name="Accept" Content="I Accept Terms and Conditions"/>
and for other cases if want to stack elements horizontally then set Orientation="Horizontal" on you StackPanel
<StackPanel HorizontalAlignment="Center" Orientation="Horizontal">

ScrollViewer in a listbox

I´m filling a listbox with a specific data, the code works fine, but I need to add a scrollviewer to the listbox because there are many elements inside, I tried to use a ScrolViewer and put inside the listbox, but doesn't work, here is the code
<StackPanel x:Name="Sites" Grid.Row="1" Orientation="Vertical">
<ListBox x:Name="ListSites" >
<ListBox.ItemTemplate>
<DataTemplate>
<Button Width="460" Height="120" Click="click" Name="btn">
<Button.Content>
<StackPanel Orientation="Vertical" Height="100" Width="460">
<TextBlock Width="460" Name="txtname" FontSize="22" Text="{Binding name}" Height="40" Foreground="CadetBlue" />
<TextBlock Width="460" Name="txtUrl" FontSize="22" Text="{Binding Url}" Height="60"/>
</StackPanel>
</Button.Content>
</Button>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>

I fixed it, simply adding the Height property in the ListBox control

If the ListBox is not given infinite space for height then it should automatically scroll when items overflow its boundaries. For instance, if the second Grid row outside your stackpanel has explicit or 'star' height set, the scrollbar in the listbox will show up automatically.
See also: Silverlight: Difficulty with ScrollViewer

You shouldn't need to add a ScrollViewer to your ListBox. It will start scrolling when it runs out of room.
However, because you've put the ListBox inside a StackPanel it won't ever think it's run out of room because the StackPanel grows infinitely in the direction of it's orientation to accommodate its contents.
You'll need to use a different container for your ListBox.

<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>