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Changing the font size of an element programmatically inside a Viewbox works weird

I need to change the font size of a label programmatically. The label is located inside a Viewbox:
<Window ...
FontSize="24"
HorizontalAlignment="Center" VerticalAlignment="Center"
WindowStyle="ThreeDBorderWindow"
ResizeMode="NoResize">
<Grid>
<Viewbox x:Name="vb" Stretch="Uniform">
<Label x:Name="label1" HorizontalContentAlignment="Center" Content="Text"/>
</Viewbox>
</Grid>
</Window>
The font size of text inside the label is assumed to be 24. However, even if I set it in my code like this to its 'original' value in xaml:
label1.FontSize = 24;
it becomes smaller.
Is there a simple way to keep the ratio between the new font size and the scale factor of the Viewbox?

You can try to set ViewBox.StretchDirection property to DownOnly, for the label will be smaller, but not bigger:
<StackPanel Width="200" >
<Label Content="Text" FontSize="24" HorizontalAlignment="Center"/>
<Viewbox StretchDirection="DownOnly" Stretch="Uniform">
<Label Content="Text" FontSize="24"/>
</Viewbox>
<Viewbox StretchDirection="DownOnly" Stretch="Uniform">
<Label Content="ABCDEF EEEEE ABCDEFGJKLMNOP" FontSize="24"/>
</Viewbox>
</StackPanel>
So the code results to :

Resize WPF TextBlock with WrapWithOverflow

I have a textblock on a window which is contained in a scroll viewer. For the textlblock I have set the text wrapping to "WrapWithOverflow". In addition I bound the textblock width property to the actual width of the scroll viewer.
My desired behavior is, that I can resize my window and the textblock should wrap the content. The window should only show the scrollbars when other controls (e.g. the buttons in the example xaml get cut)
Xaml:
<ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
<DockPanel Margin="5">
<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
<Button Content="First Button" Margin="0,0,10,0"/>
<Button Content="Second Button"/>
</StackPanel>
<DockPanel>
<TextBlock VerticalAlignment="Center" IsHitTestVisible="False" TextAlignment="Center" TextWrapping="WrapWithOverflow"
Width="{Binding RelativeSource={RelativeSource AncestorType=ScrollViewer}, Path=ActualWidth}" MaxWidth="260">
Just a small line<LineBreak />
This is the long line which will wrap during resize</TextBlock>
</DockPanel>
</DockPanel>
</ScrollViewer>
But I see the scroll bars even befor the buttons get cut. I guess this is because of the margin in the dockpanel which is required in my case.

I guess this is because of the margin in the dockpanel
Correct.
...which is required in my case.
Why? You should move the Margin to the StackPanel:
<DockPanel>
<StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Margin="5">
...
...or the buttons:
<DockPanel>
<StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
<Button Content="First Button" Margin="5,5,5,5"/>
<Button Content="Second Button" Margin="5,5,0,5"/>
</StackPanel>
...
This is necessary as the margins are included in the ActualWidth that you bind to.

Force Size on a Viewbox's Children

So I have a rather interesting question. I have a viewbox that has a few elements in it (a custom user control for an image, a canvas, a label, and a textbox). What I want is to try and have all elements scale with the viewbox, but I want the label and the textbox to have a "Max Size." I have tried using a max width and height on these controls but they seem to ignore it. If someone could take a look at my code below an slap me for what I am doing wrong that would be appreciated.
<Viewbox Name="myViewBox" Stretch="Uniform">
<!--Grid used to track mouse movements in this element for other reasons -->
<Grid Name="grdViewboxGrid" MouseMove="trackMouse">
<Canvas Name="cvsViewboxCanvas" MinWidth="270" MinHeight="270"
VerticalAlignment="Top" HorizontalAlignment="Center"
Panel.ZIndex="1" Background="Black"
MouseUp="Canvas_MouseUp"
MouseMove="Canvas_MouseMove">
<Grid>
<!--Would rather not post here for Intellectual Property reasons-->
<!-- Extension of the image control -->
<CustomImageUserControl />
<Grid>
<Grid Width="{Binding LabelWidthPercentage}"
MaxWidth="50"
Height="{Binding LabelHeightPercentage"
MaxHeight="26"
SnapsToDevicePixels="True" VerticalAlignment="Top"
HorizontalAlignment="Left" Margin="5" IsHitTestVisible="False">
<Label Name="lblViewboxLabel" HorizontalAlignment="Left"
Padding="5,5,5,0" Margin="0,5,0,0"
Style="{x:Null}"
Content="{Binding lblContent}" />
</Grid>
<Grid>
<Grid Width="{Binding TextBoxWidthPercentage}"
MaxWidth="156"
Height="{Binding TextBoxHeightPercentage}"
MaxHeight="45"
SnapsToDevicePixels="True" Vertical="Top"
HorizontalAlignment="Right" Margin="5" IsHitTestVisible="False">
<Border Style="{DynamicResource CustomBorder}" />
<Grid>
<Textbox Name="txtViewboxTextBox" Text="{Binding txtViewbox}" />
</Grid>
</Grid>
</Grid>
</Grid>
</Grid>
</Canvas>
</Grid>
</Viewbox>
If I am not including something that is needed please let me know and I will update my question. Any help would be greatly appreciated this is now day 4 on this issue sadly :-(

I am not sure why you need so many overlapping Grids, but I hope that I can answer your question nevertheless:
In order to have the label left of the text box and to assign a maximum width to each of these two controls, use a Grid with two columns and set the MaxWidth property for each column. Then, assign the label to the left column (the one with index 0) and assign the text box to the right column (index 1). The corresponding code fragment looks like this:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MaxWidth="30"/>
<ColumnDefinition MaxWidth="156" MinWidth="30"/>
</Grid.ColumnDefinitions>
<Label Grid.Column="0" x:Name="lblViewboxLabel" HorizontalAlignment="Left" Foreground="Yellow"
Padding="5,5,5,0" Margin="0,5,0,0"
Style="{x:Null}"
Content="{Binding lblContent}" />
<TextBox Grid.Column="1" x:Name="txtViewboxTextBox" Text="{Binding txtViewbox}" Background="Orange"/>
</Grid>
I also have assigned a MinWidth to the right column; this is necessary to make sure that the text box does not completely disappear if it contains no text.

WPF Window - Fade Different parts of the same window

I have a basic WPF windows with the markup as specific below:
<Window x:Class="Application.SomeWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="SomeWindow"
Topmost="True" WindowStyle="None" Height="39" Width="400"
ResizeMode="NoResize" ShowInTaskbar="False"
WindowStartupLocation="Manual" Background="Transparent"
Closing="Window_Closing" AllowsTransparency="True" Opacity="0">
<Border Background="CornflowerBlue" BorderBrush="Black" BorderThickness="0,0,0,0" CornerRadius="5,5,5,5" Opacity="0.75">
<Grid>
<!-- Display bar -->
<Image Grid.Row="1" Height="24" Margin="7,7,0,0" Name="img1" Stretch="Fill" VerticalAlignment="Top" Source="/Application;component/Images/dashboard/1.png" HorizontalAlignment="Left" Width="13" />
<Image Height="24" Margin="19,7,47,0" Name="image21" Source="/Application;component/Images/dashboard/2.png" Stretch="Fill" VerticalAlignment="Top" Grid.Row="1" Grid.ColumnSpan="2" />
<!-- Button 1 -->
<Button Style="{DynamicResource NoChromeButton}" Height="27" Margin="0,5,25,0" Name="btn1" Click="btn1_Click" VerticalAlignment="Top" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Right" Width="23" ToolTip="1">
<Image Height="26" HorizontalAlignment="Right" Name="img1" Source="/Application;component/Images/dashboard/3.png" VerticalAlignment="Top" Width="22" Stretch="Fill" />
</Button>
<!-- Button 2 -->
<Button Style="{DynamicResource NoChromeButton}" Height="27" Margin="0,5,5,0" Name="btn2" Click="btn2_Click" VerticalAlignment="Top" Grid.Row="1" Grid.Column="1" HorizontalAlignment="Right" Width="23" ToolTip="2">
<Image Height="26" HorizontalAlignment="Right" Name="img2" Source="/Application;component/Images/dashboard/4.png" VerticalAlignment="Top" Width="22" Stretch="Fill" />
</Button>
</Grid>
</Border>
</Window>
Here is what it looks like now:
What I'd really like to do is make it so that initially looks like this:
Then, once mouseover happens, to fade background opacity in from 0 so it looks like the first image. The problem is that if I set the Border or Grid Background color to Transparent with the goal of fading in on mouseover, then everything inside the Border or Grid is affected as well.
Is there a way to manage the opacities of window and its UI elements seperately? Or perhaps there is a totally different route to take to get this background fade on mouseover? Thanks.

There are two options. Number one is to just move the outer border inside the grid, as the first child (and have the other controls alongside it, not in it). That way it will fade by itself, but still be behind the other controls. You will of course either have to set ColumnSpan/RowSpan, or wrap the entire thing in another Grid.
The second option is to just fade the background, not the entire border:
<Border ...>
<Border.Background>
<SolidColorBrush Color="CornflowerBlue" Opacity="0.5"/>
</Border.Background>
...

try this trick - draw a rectangle or border with dimensions bind to parent or ElementName.
It won't affect rest of elements of tree. Works for me.
<Grid x:Name="abc">
<Border
Width="{Binding ActualWidth, ElementName=abc}"
Height="{Binding ActualHeight, ElementName=abc}"
Background="Blue"
Opacity="0.5"/>
//buttons or inner grid
...
</Grid>
If you don'w want to use ElementName, simply replace Width and Height by
Width="{Binding ActualWidth, Source={RelativeSource Mode=FindAncestor, AncestorType=Grid}}"
Height="{Binding ActualHeight, Source={RelativeSource Mode=FindAncestor, AncestorType=Grid}}"

C# - Windows Phone - MaxWidth & MaxHeight property being ignored

I have some Canvases in a ListBox. Inside these Canvases I have some TextBlocks which have their text bound to them. However when I try to use a MaxWidth/Height property on the text block (or the standard Height/Width), the properties are ignored! So I end up with the text overspilling the Canvas in cases.
I would much appreciate any help on the matter, and I hope I'm not just being a blind idiot!
Oh, and here's the code (the TextBlock I'm talking about is the first one):
<ListBox Margin="0,-9,-12,0" ItemsSource="{Binding}" Name="listBoxNotes" HorizontalAlignment="Left" VerticalAlignment="Top" Width="400" Height="548">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<Canvas Height="175" Width="360" Background="{StaticResource PhoneAccentBrush}" toolkit:TiltEffect.IsTiltEnabled="True" Name="canvasNote" Tap="canvasNote_Tap">
<TextBlock Text="{Binding Title}" FontWeight="Bold" FontSize="26" Foreground="White" Canvas.Left="10" Canvas.Top="5" x:Name="Title" Width="100" MaxWidth="100"/>
<TextBlock Text="{Binding Details}" TextWrapping="Wrap" Width="352" FontSize="24" Foreground="White" Canvas.Left="10" Canvas.Top="35" />
</Canvas>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

The problem with this is Canvas does not limit the size of their children, and especially theTextBlock control will grow as much as it needs.
Many ways to solve your problem :
Do not use TextBlock but a TextBox
Do not use Canvas but another container such as Border, Grid, StackPanel...
Try to clip the TextBlock content
<TextBlock.Clip>
<RectangleGeometry Rect="0, 0, 50, 30"/>
</TextBlock.Clip>