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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.

Stackpanel: Black background on wp8

I have one problem - my stackpanel is vey big and it breaks(background color is changed to black).. What should i do to improve it?
<Grid x:Name="LayoutRoot" Background="#FF2D2D2D" >
<Grid.RowDefinitions>
<RowDefinition Height="60"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel x:Name="TitlePanel" Orientation="Horizontal" Grid.Row="0">
..
</StackPanel>
<ScrollViewer Name="viewer" Grid.Row="1" >
<StackPanel Name="ContentGrid" Canvas.ZIndex="1" Margin="0, 0,0,80" Background="White" Width="452">
<Image Name="ImageImage" Height="300" VerticalAlignment="Top"/>
<TextBlock Name="DateText" TextWrapping="Wrap" TextAlignment="Center" FontSize="18" Foreground="Black"/>
<TextBlock Name="TitleText" TextWrapping="Wrap" FontSize="20" TextAlignment="Center" Foreground="Black" Margin="10,0"/>
<TextBlock TextWrapping="Wrap" Margin="10,15,10,2" Name="DescroptionText" FontSize="23" Foreground="#FF494949" FontFamily="Portable User Interface"/>
<TextBlock TextWrapping="Wrap" TextTrimming="WordEllipsis" Margin="10,0,10,2" Name="DescroptionText2" FontSize="23" Foreground="#FF494949"/>
<ListBox SelectionChanged="GridImages_SelectionChanged" ScrollViewer.VerticalScrollBarVisibility="Disabled" Name="GridImages" ItemTemplate="{StaticResource AttachmentsItemTemlate}" Grid.RowSpan="2" FontFamily="Portable User Interface" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel Orientation="Horizontal" FlowDirection="LeftToRight" ItemWidth="150" ItemHeight="150"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</StackPanel>
</ScrollViewer>
</Grid>

There is a limitation of 2048px in Windows Phone UIElements.
You should try to break your different elements into smaller elements (for example: you could put several stackpanels inside the first one).
In TextBox elements there is a workaround explained here.

Best this is to make the Main Window to white background and Make your stackpanel as transparent background instead of giving any color to it. It works great as I have tested it.

Try this code, but first you need to add windows toolkit library.
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
<toolkit:PhoneTextBox
TextWrapping="Wrap"
Name="txtString"
ScrollViewer.VerticalScrollBarVisibility="Visible"
MaxHeight="200"
PlaceholderText="Add text"
Padding="5"
Width="370"
FontFamily="Open Sans Light"
FontSize="22"
Height="Auto" ///Use Auto or provide height value
Margin="10"
/>
This code is used for Scrolling as well work for Auto Growing Textbox. If you don't want Auto Growing Textbox then provide height instead of Auto in Height attribute.

Cannot scroll to bottom wpf

I have a listbox with objects but I cannot scroll to the bottom of the page. What is the problem? This is the code that I'm using.
<Grid>
<Image Name="Nietcomment" Source="write.png" Width="70" Margin="350,-850,0,0" Tap="Login_popup" Visibility="Visible"/>
<Image Name="welcomment" Source="write2.png" Width="70" Margin="350,-850,0,0" Tap="Login_popup_remove" Visibility="Collapsed"/>
<ScrollViewer Name="scrollview" VerticalScrollBarVisibility="Visible" Margin="0,0,0,0" Foreground="Black">
<StackPanel>
<TextBlock x:Name="NTitelComment" Text="{Binding}" TextWrapping="Wrap" FontSize="25" Margin="10,0,10,0" Foreground="#FFE5001b"/>
<Line Stretch="Fill" Stroke="Black" X1="0" X2="1" Y1="0" Y2="0" Margin="10,0,10,0"/>
<TextBlock x:Name="tijdComment" Text="{Binding}" Margin="50,0,10,0" Foreground="Black"/>
<Image Height="20" Width="20" Margin="-380,-20,0,0" Source="/PostDateIcon.png"/>
<ListBox Margin="0,0,0,20" Name="lbComments" VerticalAlignment="Top" />
</StackPanel>
</ScrollViewer>
</Grid>

If you put a border around your ScrollViewer, can you see if it goes outside of the screen maybe? Will it help to set a fixed height of the Grid or ScrollViewer?
Keep in mind the phone has built in scroll, so your ScrollViewer maybe doesn't play well with it.

With so much fixed margins, your layout will be impossible to manage, especially when dealing with differents screen resolutions and especially with negative margins.
Anyway, right now, you have two scrollviewers, as your listbox contains one as well.
You should disable the listbox scrollviewer or it will prevent your page to scroll.
Just change your listbox:
<ListBox
Margin="0,0,0,20"
ScrollViewer.VerticalScrollBarVisibility="Disabled"
Name="lbComments"
VerticalAlignment="Top" />
It will disable it's scrollviewer and allow it to scroll with the rest of the page.

Windows Phone 8 - TextBlock in StackPanel not wrapping Text properly?

I have an app that is based on the Panorama control. Clicking on an item on one of the Panorama control's pages (tabs) goes to a details page. On that details page I have the XAML below that renders the item content. As you can see there is a TextBlock hosted by a StackPanel in the phone:PanoramaItem.Header element. I want the text in that element to wrap the video title the TextBlock is bound to in the view model. I have TextWrapping set to wrap and I have assigned it a fixed width so the TextBlock doesn't grow/expand (and therefore won't wrap). The text does wrap, but some lines still appear clipped with some words appearing "cut off". What is wrong with my XAML?
I read about using a DockPanel instead:
TextBlock Wrapping in WPF Layout
But this app has a StackPanel used on a lot of different pages so if I can stick with a StackPanel I'd prefer it.
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid Grid.Row="0" Visibility="{Binding IsInternetAvailable}" Background="{StaticResource PhoneAccentBrush}" Height="30">
<TextBlock Text="{Binding Path=LocalizedResources.NoConnection, Source={StaticResource LocalizedStrings}}" Margin="10, 0"/>
</Grid>
<phone:Panorama x:Name="PanoramaFavorites_DetailVideos" Grid.Row="2" Foreground="{StaticResource CustomApplicationTextBrush}" Background="{StaticResource CustomApplicationBackgroundImage}" SelectionChanged="panoramaFavorites_DetailVideos_SelectionChanged">
<phone:Panorama.Title>
<StackPanel Orientation="Horizontal" Margin="0,15,0,0">
<Image Height="85" Width="85" Source="http://appstudiodata.blob.core.windows.net/apps/1383/db936107-bce6-41a2-9d95-1d342f66c6bb/res/Logo-b3883645-a6cd-4cc8-82be-97c87a266656.png" Stretch="Uniform" VerticalAlignment="Bottom" HorizontalAlignment="Left" Margin="5,0,10,5" RenderTransformOrigin="0.5,0.5" />
<TextBlock FontSize="92" Text="Robot Videos" FontFamily="Segoe WP Light" Foreground="{StaticResource CustomTitleApplicationTextBrush}" VerticalAlignment="Stretch"/>
</StackPanel>
</phone:Panorama.Title>
<phone:PanoramaItem x:Name="PanoramaFavorites_DetailVideos0" Margin="0,0,0,25">
<phone:PanoramaItem.Header>
<StackPanel Orientation="Horizontal" Margin="0,7,0,0">
<TextBlock Text="{Binding CurrentYouTubeVideo.Title, Converter={StaticResource SanitizeString}}" Foreground="{StaticResource CustomApplicationTextBrush}" FontSize="36" TextWrapping="Wrap" Width="440" Height="170"/>
</StackPanel>
</phone:PanoramaItem.Header>
<ctl:FlipControl NextElementCommand="{Binding NextpanoramaFavorites_DetailVideos0}" PreviousElementCommand="{Binding PreviouspanoramaFavorites_DetailVideos0}" ShowPreviousButton="{Binding HasPreviouspanoramaFavorites_DetailVideos0}" ShowNextButton="{Binding HasNextpanoramaFavorites_DetailVideos0}">
<ctl:FlipControl.InnerContent>
<Grid Margin="10,5,5,5">
<ScrollViewer>
<ctl:YouTubePlayer Margin="0,10" MaxHeight="250" VerticalAlignment="Top" VideoId="{Binding CurrentYouTubeVideo.VideoId, TargetNullValue={StaticResource DefaultNoImageValue}}"/>
</ScrollViewer>
</Grid>
</ctl:FlipControl.InnerContent>
</ctl:FlipControl>
</phone:PanoramaItem>
</phone:Panorama>
</Grid>

As per your comments, this works for me:
<StackPanel Orientation="Vertical" Margin="0,7,0,0">
<TextBlock Text="{Binding CurrentYouTubeVideo.Title, Converter={StaticResource SanitizeString}}"
Foreground="{StaticResource CustomApplicationTextBrush}"
FontSize="36"
TextWrapping="Wrap"
MaxWidth="440"/>
</StackPanel>

WPF Button with multiple text elements for 10 foot gui

I am trying to create buttons for a 10-foot GUI using WPF. Each button requires a little more data than just a single text string and an image, maybe 2-3 strings located in different positions and some imagery.
I have tried
<Button Height="52" HorizontalAlignment="Stretch" Name="button1" Width="407">
<Button.Content>
<DockPanel LastChildFill="True" HorizontalAlignment="Stretch">
<TextBlock Name="textBloczk2" Text="ABC" TextAlignment="Left" DockPanel.Dock="Left"/>
<TextBlock Name="textBlxock1" Text="CDE" TextAlignment="Right" DockPanel.Dock="Right"/>
</DockPanel>
</Button.Content>
</Button>
But no matter which inner container I use, the button seems to disregard the layout from the DockPanel and the combined text ends up in the middle of the button. Am I doing something wrong or should I be using a different outer container ?

The problem seems to be that the DockPanel's width is so small that the Right and Left panels are the same width as your TextBlocks.
This seems to work as expected (setting the width of the DockPanel):
<Button Height="52" HorizontalAlignment="Stretch" Name="button1" Width="407">
<Button.Content>
<DockPanel LastChildFill="True" Width="300">
<TextBlock Name="textBloczk1" Text="Left" DockPanel.Dock="Left" />
<TextBlock Name="textBlxock2" Text="Right" DockPanel.Dock="Right" />
<TextBlock Name="textBlxock3" Text="Top" DockPanel.Dock="Top" />
<TextBlock Name="textBlxock4" Text="Bottom" DockPanel.Dock="Bottom" />
</DockPanel>
</Button.Content>
</Button>

Try to add "HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" to your button. This way dockpanel will occupy all space inside the button.