<ColumnDefinition Width="*" /> not respected in DataTemplate - wpf

Question

I have a WPF ListBox with a defined DataTemplate. In that template, I have a grid, where the first column width should take up all remaining room in the grid.
This seems to work outside the ListBox, but not inside. Why is that, and how can I get it to behave the same?
Here is my code. See line 36, and line 70
<UserControl x:Class="Russound.Windows.UI.UserControls.MAX.Reports.UniversalReportsWpf"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="250" Width="900" >
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Height="35" Padding="0,3,5,0" Text="Standard Reports" HorizontalAlignment="Right" FontWeight="Bold" FontSize="20" Foreground="DarkBlue"/>
<Border Grid.Row="1">
<Grid>
<Grid.Resources>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="VerticalAlignment" Value="Top"/>
<Setter Property="Height" Value="20"/>
<Setter Property="Padding" Value="0,3,5,0"/>
<Setter Property="Cursor" Value="Hand"/>
<Setter Property="Foreground" Value="WhiteSmoke" />
</Style>
</Grid.Resources>
<Grid.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FF808080" Offset="0"/>
<GradientStop Color="#FF000000" Offset="1"/>
</LinearGradientBrush>
</Grid.Background>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="300*" />
<ColumnDefinition Width="150" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="50" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="Report Name" FontWeight="Bold"/>
<TextBlock Grid.Column="1" Text="Last Run Date" FontWeight="Bold"/>
<TextBlock Grid.Column="2" Text="Last Ran By" FontWeight="Bold"/>
<TextBlock Grid.Column="3" Text="Secure" FontWeight="Bold"/>
</Grid>
</Border>
</Grid>
<ListBox Grid.Row="1" ItemsSource="{Binding}"
ItemTemplate="{DynamicResource reportLayout}"
VirtualizingStackPanel.VirtualizationMode="Recycling"
MouseDoubleClick="DisplaySelectedReport" Grid.RowSpan="2">
<ListBox.SelectedItem>
<MouseBinding MouseAction="LeftDoubleClick"
Command="ApplicationCommands.Open" />
</ListBox.SelectedItem>
<ListBox.Resources>
<DataTemplate x:Key="reportLayout" DataType="AdHockReport">
<Grid>
<Grid.Resources>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="VerticalAlignment" Value="Top"/>
<Setter Property="Height" Value="25"/>
<Setter Property="Padding" Value="0,3,5,0"/>
<Setter Property="Cursor" Value="Hand"/>
</Style>
</Grid.Resources>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="150" />
<ColumnDefinition Width="100" />
<ColumnDefinition Width="50" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" ToolTip="Report Name" Text="{Binding Path=DisplayName}" FontWeight="Bold"/>
<TextBlock Grid.Column="1" ToolTip="Last Run Date" Text="{Binding Path=LastRunDate, StringFormat=MMM dd\, yyyy h:mm tt}" />
<TextBlock Grid.Column="2" ToolTip="Last Run By" Text="{Binding Path=LastRunBy}" />
<TextBlock Grid.Column="3" ToolTip="Secure" Text="{Binding Path=IsSecure}" />
</Grid>
</DataTemplate>
</ListBox.Resources>
<ListBox.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFE5E5E5" Offset="0"/>
<GradientStop Color="#FF888888" Offset="1"/>
</LinearGradientBrush>
</ListBox.Background>
</ListBox>
</Grid>
</UserControl>

Answer 1

This is because the ListBoxItem containing the grid is sizing to content. Therefore the "remaining space" for the star-sized column to fill is only as much as the column needs.
To fix this, use the ListBox.ItemContainerStyle to set ListBoxItem.HorizontalContentAlignment to Stretch.

Answer 2

Try editing the ControlTemplate of ListBox and remove the scrollviewer inside that, Let it be just ItemsPresenter inside Border.