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WPF ScrollView and TextBlock

What am I doing wrong?
The following code works:
<ScrollViewer x:Name="scrollChatMessages">
<TextBlock x:Name="txtChatMessages" TextWrapping="Wrap"/>
</ScrollViewer>
But once I touch it up with the designer so it looks neater and doesn't take over the entire Grid, the ScrollView doesn't scroll the content of the Scrollblock anymore:
<ScrollViewer x:Name="scrollChatMessages" HorizontalAlignment="Left" Height="181" Margin="95,10,0,0" VerticalAlignment="Top" Width="300">
<TextBlock x:Name="txtChatMessages" HorizontalAlignment="Left" TextWrapping="Wrap" VerticalAlignment="Top" Height="181" Width="300"/>
</ScrollViewer>
Could someone explain this behaviour to me?
Thanks in advance!

Without a good Minimal, Complete, and Verifiable code example it's impossible to say for sure. But you can see that the Designer has added a bunch of new property values for both elements. In particular, the ScrollViewer and TextBlock have been set to have the same exact width and height.
Naturally, with the contained element having exactly the correct dimensions to fit within the ScrollViewer, there's no need to scroll to see all of it. You need to remove the Width and Height property values from the TextBlock.

I solved it by placing it inside of a Grid.
<Grid x:Name="gridChatMessages" HorizontalAlignment="Left" Height="181" Margin="95,10,0,0" VerticalAlignment="Top" Width="300">
<ScrollViewer x:Name="scrollChatMessages">
<TextBlock x:Name="txtChatMessages" TextWrapping="Wrap"/>
</ScrollViewer>
</Grid>

WPF ScrollViewer is not working

I want to add scroll view to my program and I tried ScrollView control but that don't take effect. It's my first time dealing with scrolls please help me :).
My xaml Code:
<DockPanel Grid.Row="1" Background="#FF695887">
<ScrollViewer VerticalScrollBarVisibility="Auto" Height="795">
<Canvas Name="zemelapis" Height="Auto" Width="Auto">
<Image Name="pav_kelias" />
<Image Name="car1" />
</Canvas>
</ScrollViewer>
</DockPanel>
Because these 2 images is not fitting here I need a scroll for them. Maybe I should use ScrollBar?
My program example: https://gyazo.com/a4ba7e4d5004632e2229a87e686c4c09
, as you can see bottom image is not fitting in range of window.

You have specified Auto as Height and Width. This implies that the Canvas will fill the height available to it.
From the documentation:
Auto sizing behavior implies that the element will fill the height
available to it.
In this case the available height is the height of the ScrollViewer.
If you want the Canvas to be bigger, and hence the ScrollViewer to scroll, you should set a height on Canvas that is bigger than the height of ScrollViewer.
So, for example:
<DockPanel Grid.Row="1" Background="#FF695887">
<ScrollViewer VerticalScrollBarVisibility="Auto" Height="795">
<Canvas Name="zemelapis" Height="1000" Width="Auto">
<Image Name="pav_kelias" />
<Image Name="car1" />
</Canvas>
</ScrollViewer>
</DockPanel>

If you want your ScrollViewer to work easily, use a Grid instead of a Canvas:
<DockPanel Background="#FF695887">
<ScrollViewer >
<Grid Name="zemelapis">
<Image Name="pav_kelias" Source="acteurs.png"/>
<Image Name="car1" Source="public.jpg"/>
</Grid>
</ScrollViewer>
</DockPanel>
As explain by Domysee, Canvas gives you total control of the layout. Grid however will automatically adjust its size depending on the content.
See http://www.wpf-tutorial.com/panels/introduction-to-wpf-panels/

Optical zoom in ScrollViewer having odd panning behavior

I'm building a picture viewing app. In it I have a FlipView that shows individual images, where you can optical zoom each image. The experience is very similar to the FlipView/Optical zoom you see in the default Photos app in windows 8 (which is built using html).
I'm using a ScrollViewer for optical zoom. Optical zoom seems to be working fine except there is an odd panning behavior. You can still use a single finger to pan the image around, before it goes back to it's original position.
The photos app doesn't allow this, and I'm trying to achieve a similar behavior. Is there some way to disable panning the image around using the built in ScrollViewer control? I still want zooming in to work, but panning should be disabled. I think this should be achievable using manipulation events instead of ScrollViewer, but obviously ScrollViewer would be simpler.
<ScrollViewer x:Name="scrollViewer1" ZoomMode="Enabled" MaxZoomFactor="2.0" MinZoomFactor="1.0" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" HorizontalAlignment="Center">
<FlipView x:Name="flipView1" Width="1140" SelectionChanged="flipView1_SelectionChanged">
<FlipView.ItemTemplate>
<DataTemplate>
<Grid>
<Image x:Name="CurrentImage" Source="{Binding}" DoubleTapped="CurrentImage_DoubleTapped">
</Image>
</Grid>
</DataTemplate>
</FlipView.ItemTemplate>
</FlipView>
</ScrollViewer

You have added the FlipView to ScrollView since you must add the scrollview to flipview item template, and the image must be inside the scrollview, your xaml code must be like this:
<FlipView x:Name="flipView1" Width="1140" SelectionChanged="flipView1_SelectionChanged">
<FlipView.ItemTemplate>
<DataTemplate>
<Grid>
<ScrollViewer x:Name="scrollViewer1" ZoomMode="Enabled" MaxZoomFactor="2.0" MinZoomFactor="1.0" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" HorizontalAlignment="Center">
<Image x:Name="CurrentImage" Source="{Binding}" DoubleTapped="CurrentImage_DoubleTapped">
</Image>
</ScrollViewer>
</Grid>
</DataTemplate>
</FlipView.ItemTemplate>
</FlipView>

Scrollable canvas containing imges in windows phone 8

I am working on a windows phone 8 app. I have a canvas containing images which I can drag to change their position in canvas. My problem is that canvas is not scrollable, I want a vertical scrollbar in page. I tried like this
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ScrollViewer x:Name="scvImages" HorizontalAlignment="Stretch"
VerticalAlignment="Stretch" Margin="0"
HorizontalContentAlignment="Stretch" Height="Auto" Width="Auto">
<Grid Height="Auto" Width="Auto">
<Canvas x:Name="canImages" Height="Auto" Width="Auto">
</Canvas>
</Grid>
</ScrollViewer>
</Grid>

At first glance it looks like there's nothing telling the ScrollViewer to invoke since your Grid and Canvas are just going to fill the ViewPort so you might consider setting a fixed Height or something on your Grid

You must specify the height of your panel (canvas, grid, whatewer) which you want to scroll. Otherwise it will render out of the screen but 'thinks' that it is ok and scrolling is no needed (since it is infinite height).

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 >