StackPanel expanding outside size of parent grid - wpf

Question

I'm pretty new with WPF, so apologies if I'm missing something obvious. I have this template that is bound to items in an obs. collection. I'm trying to get it so that the 2nd column, the "test test..." part has a variable width that fills all the available space in the parent grid.
What I'm finding though, is that my code automatically shows all the text for that "test test..." text box as opposed to just binding to the available space in the grid, and instead creates the scroll bar that you see below.
I instead, want that "test test" to be cut off so that everything else fits so that no scroll bar appears (that when, if the user resizes the screen then that "test test..." textbox will automatically resize to fit the new space). Is there a way to do that?
My code for that template is as follows:
<DataTemplate x:Key="MainTemplate">
<Grid Margin="4" ClipToBounds="True">
<Grid.Resources>
<local:BooleanToHiddenVisibility x:Key="boolToVis"/>
</Grid.Resources>
<StackPanel Orientation="Vertical" ClipToBounds="True">
<Grid Width="Auto" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="25"/>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="60" />
<ColumnDefinition Width="40" />
<ColumnDefinition Width="60" />
<ColumnDefinition Width="40" />
<ColumnDefinition Width="60" />
<ColumnDefinition Width="40" />
<ColumnDefinition Width="40" />
</Grid.ColumnDefinitions>
<CheckBox Grid.Column="0" Name="checkViewTextBox"/>
<TextBlock Grid.Column="1" Text="{Binding OriginalQuote}" FontWeight="Bold" TextTrimming="WordEllipsis" FontStyle="Italic" ClipToBounds="True"/>
<TextBlock Margin="10,0,0,0" Grid.Column="2" Text="plane :" FontWeight="SemiBold" Width="60"/>
<TextBlock Margin="5,0,0,0" Grid.Column="3" Text="{Binding Mid}" Width="40"/>
<TextBlock Margin="10,0,0,0" Grid.Column="4" Text="data2 :" FontWeight="SemiBold" Width="60"/>
<TextBlock Margin="5,0,0,0" Grid.Column="5" Text="{Binding MidTwo}" Width="40"/>
<TextBlock Margin="10,0,0,0" Grid.Column="6" Text="data3:" FontWeight="SemiBold" Width="60"/>
<TextBlock Margin="5,0,0,0" Grid.Column="7" Text="{Binding MidThree}" Width="40"/>
<Button Margin="10,0,0,0" Content="History" Grid.Column="8" Click="History_Click" Width="40"/>
</Grid>
<StackPanel Orientation="Horizontal" Visibility="{Binding Path=IsChecked, ElementName=checkViewTextBox, Converter={StaticResource boolToVis}}">
<StackPanel.Resources>
<Style BasedOn="{StaticResource tbstyle}" TargetType="{x:Type TextBlock}" />
</StackPanel.Resources>
<!--Other stuff thats working ok-->
</StackPanel>
</Grid>
</DataTemplate>
Any help is much appreciated!
P.S. I've been adding random proprieties hoping one will work, so if looks like I have random things on there, that's probably why....

Answer 1

Well, not sure it will help you but some words about WPF layout.
It has two steps: measure and arrange.
At the first stage, the control tries to calculate its desired state. StackPanel asks its children about their desired sizes. It does not limit their size. (TextBlock with the binding to OriginalQoute has no explicitly set width!)
At the second stage, control is arranged.
Stack panel is allowed to occupy the whole left space of the column but it arranges its children as if its size was unlimited, so TextBlock shows the text completely.
The question is how to limit the size of the TextBlock?
Try binding
<TextBlock Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=StackPanel}, Path=ActualWidth}"/>