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Why the icon is inserted crookedly into the button. С# WPF

XAML:
<Grid Height="22" VerticalAlignment="Top" Background="#FF1368BD" >
<Button x:Name="ButtonPowerOff" HorizontalAlignment="Right" Height="22" Width="22" Background="{x:Null}" BorderBrush="{x:Null}" Click="ButtonPowerOff_Click">
<materialDesign:PackIcon Width="15" Height="15" Kind="WindowClose" HorizontalAlignment="Center" Margin="0 0 0 0" ></materialDesign:PackIcon>
</Button>
</Grid>

You can try setting the height and width of the button to "auto" and also set the padding to "0" in the button. Also delete the HorizontalAlignment of the icon.

I don't know what library is PackIcon, and that's is important because I don't know it behaviour. But I can tell...
Why do you set the PackIcon size if you have set the Button size?
The problem here is button maybe has default padding making the "effective content" size of the button smaller than image, and the image is doing what you want but "the space needed is greater than i have".
Let the image stretch in the button (without setting the size of it) or let the button fit the image 15x15 size (without setting the size of the button).
Everything in WPF is ready for sizeless/locationless layout. Except Canvas children, of course; and some bizarre behaviour of Image control.
If you can avoid use Width and Height in your controls (sometimes you can't) you should do it. Instead use margins, alignments and paddings. This way you let the window and controls be totally responsive.

ScrollViewer scrollbars not appearing

I'm working on updating previously working app. Testing shows the ScrollViewer acting oddly when the Zoom makes part of the contained images fall off the screen. The original app was created with VS 2013 as a Universal Windows app. The new app is created with VS 2015 as a Universal Windows app though the target build has been shifted to the anniversary release.
My XAML is defined so:
<ScrollViewer x:Name="SV1" Grid.Row="1" HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto"
SizeChanged="SV1_SizeChanged" ZoomMode="Enabled" >
<StackPanel x:Name="ImagePanel" Orientation="Horizontal" HorizontalAlignment="Center"
VerticalAlignment="Top" >
<Image x:Name="ImageLeft" Stretch="Uniform" />
<Image x:Name="ImageRight" Stretch="Uniform" />
</StackPanel>
</ScrollViewer>
The user can change the ZoomLevel of the ScrollViewer. The zoom change is implemented using SV1.ChangeView(null, null, zoomFactor).
The images visibly change size on the screen, but as they fall off the right or bottom the scrollbars don't appear. Even changing the visibility properties to "Visible" instead of "Auto" doesn't cause the scrollbars to appear. When the size changes and for a brief instant a thin line will appear where the bars should be and then disappear. Additionally, user input that would normally scroll like moving the mouse wheel does nothing.
Based on other commentary, I've tried replacing the StackPanel with a Grid with no apparent effect.
I'm drawing a blank. Any ideas?

It appears the answer is the next control which shares the same visual space needs to be set to Visibility="Collapsed" in the XAML. The visibility is controlled programmatically, but without the XAML tag the scrollbars of the previous control don't appear and with the tag they do.

Pinch zoom on image C#/XAML

I'm creating a simple slideshow on UWP using C#/XAML
I've got a problem with the zoom on image.
In fact when I zoom, if I try to move the picture, it moves, but when I remove my hand, the picture is coming back to a "default position" like it was linked to a border or something like this...
Here is sample of my XAML
<FlipView x:Name="flipView" Grid.RowSpan="2" VerticalAlignment="Top"
Margin="0,280,0,0" Height="1490" Background="Black">
<FlipViewItem Height="1620" Width="1080">
<ScrollViewer ZoomMode="Enabled">
<Image x:Name="image" Source="Images/test.jpg" VerticalAlignment="Top"
Height="1610" Margin="0,10,0,0"/>
</ScrollViewer>
</FlipViewItem>
Do you have any idea of what can cause this ??

I just solved the problem by adding horizontal and vertical scroll bar option on auto

It's because the MaxWidth and MaxHeight of your page is becoming smaller than the image itself.
Have a look at this blogpost which gives a good solution:
http://igrali.com/2015/07/16/why-is-my-zoomable-scrollviewer-snapping-the-image-to-the-left/

XY coordinates of WPF button move on runtime?

I got a pretty weird behavior of my WPF application: the XY position of my button on runtime seems to be divergent to that when I set it in my xaml-Editor of Visual Studio (is there a name for it btw?)
It has no alignments set or panels around it, i have only set it by margins. My button has the following code:
<Button Content="OK" Height="23" Margin="213,319,4,7" Name="button3" Width="75" IsCancel="True" Click="button3_Click" IsEnabled="False" />
Edit:
The margins are fixed because it is a non-resizable dialog. As you can see, the button's slightly moved to the left and up:
xaml-Editor:
Runtime:
Why is that and how can I fix it?

I guess the below link about the Alignment, Margins, and Padding Overview will help you to understand how it is works?
Else place a panel wrappers such as Stackpanel, Wrappand or Grid. It's suitable to work the layout of the controls
EDIT : The problem was with the ResizeMode="NoResize". If you remve this attribute in Window tag, then alignment would be good
Link to Refer

Man, that's the worst way to set the position of a UI element in WPF!
Refactor your XAML to something like this:
<Grid Margin="5">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<ListView Grid.Row="0" Name="TableList" Margin="5"/>
<Button Grid.Row="1" Name="button3" Content="OK"
Margin="5"
Width="75"
HorizontalAlignment="Right"/>
</Grid>
You see? There is a Grid that handles the position of all its children (in this case, a ListView and a Button).
The Button is put on the second Row, aligned to the right (HorizontalAlignment property).
Both the Grid and its children have Margin=5. This guarantees that the margin of every children is equal respect to the adiacent children and to other controls outside the Grid.
Also, the ListView and the Button are perfectly aligned.
The problem with your approach is that you set the Button Width and its Left Margin and its Right Margin. Maybe the total is not correct because the border of the Window eats some pixel, or simply WPF can't handle all the informations together and misses the calculation, who knows, but the consequence is that you must leave at least one parameter free. In my example, I left free the Margins from the Window. The Margin=5 sets only the relative Margin respect to the other controls, but how much the Button is distant from the left border of the Window is something I leave to the WPF graphical engine to calculate.

How do I control clipping in C# or XAML when using UniformToFill with an image

I have an image control in a resizable window with its stretch property set to UniformToFill.
<Image Name="some_image" Stretch="UniformToFill" Margin="0,0,0,0" />
The clipping window is pegged to the top left of the image; resizing chops off the right and bottom of the image.
I want the image to be clipped equally on all sides. Am I being dense and overlooking an obvious solution?
How do I control how the image gets clipped?
(Unrelated: This is my first post to stackoverflow. I just wanted to start off saying, thanks, this site has been amazing resource for me)

The HorizontalAlignment and VerticalAlignment property determine this behavior with an image control.
<Image Name="some_image" Stretch="UniformToFill" Margin="0,0,0,0" HorizontalAlignment="Center" VerticalAlignment="Center" />
Guess i was being dense!