TextBox Not Sizing

[Kevin Marois]

I have an app that converts a PDF to a text file and displays the contents in a textbox inside a tab control. The contents of the file is then displayed in a textbox in the tab. Here's a screenshot[^]. The file loaded here is 3 1/2 pages long. It appears that the textbox has stretched past the bottom of the tab, yet the textbox's scroolbar is disabled and nothing scrolls, even when I drag select. Am I doing this wrong? Thanks Here's the relevant window XAML:

<TabControl Grid.Row="2"
Grid.Column="0"
ItemsSource="{Binding Files, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedFile, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
BorderBrush="SteelBlue"
BorderThickness="1"
Margin="2,0,2,0">

<TabControl.ItemContainerStyle>
    <Style TargetType="TabItem">
        <Setter Property="Header" Value="{Binding FileName}"/>
    </Style>
</TabControl.ItemContainerStyle>

</TabControl>

The DataTemplate for the tab is:

<Grid>

<Grid.RowDefinitions>
    <RowDefinition Height="Auto"/>
    <RowDefinition Height="\*"/>
</Grid.RowDefinitions>

<TextBlock Grid.Row="0" 
            Text="{Binding FullName}"
            Margin="2,2,2,5"/>

<ScrollViewer Grid.Row="1">

    <TextBox Text="{Binding FileContent}"
                Margin="2,0,2,2"
                BorderBrush="LightGray"
                BorderThickness="1"
                FontFamily="Courier New"
                FontSize="12"/>

</ScrollViewer>

</Grid>

In theory, theory and practice are the same. But in practice, they never are.” If it's not broken, fix it until it is. Everything makes sense in someone's mind.