WPF - Listview Databound Column Width Problem.

Question

Given below xaml using .Net3.5 -

 <ListView Name="RawData" AlternationCount="2" ItemsSource="{Binding}"
                          ScrollViewer.VerticalScrollBarVisibility="Visible" Grid.Row="1"
                          Grid.ColumnSpan="4"
                           IsSynchronizedWithCurrentItem="True"
                            sorter:GridViewSort.AutoSort="True"
                            sorter:GridViewSort.ShowSortGlyph="False" >
                    <ListView.ItemContainerStyle>
                        <Style TargetType="ListViewItem">
                            <Setter Property="HorizontalContentAlignment" Value="Center" />
                            <Style.Triggers>
                                <Trigger Property="ItemsControl.AlternationIndex" Value="1">
                                    <Setter Property="Background" Value="LightGray"></Setter>
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </ListView.ItemContainerStyle>
                    <ListView.View>
                        <GridView>
                            <GridViewColumn Header="Date" DisplayMemberBinding="{Binding Path=GetDate}"  Width="Auto"
                                            sorter:GridViewSort.PropertyName="GetDateTime"/>
                            <GridViewColumn Header="Time" DisplayMemberBinding="{Binding Path=GetTime}"  Width="Auto"
                                            sorter:GridViewSort.PropertyName="GetDateTime"/>
                            <GridViewColumn Header="Scan Time" DisplayMemberBinding="{Binding Path=ScanTimeSec}"
                                            sorter:GridViewSort.PropertyName="ScanTimeSecond"  Width="Auto"/>
                            <GridViewColumn Header="Ping Time" DisplayMemberBinding="{Binding Path=PingTimeSec}"
                                            sorter:GridViewSort.PropertyName="PingTimeSec"  Width="Auto" />
                            <GridViewColumn Header="Fault Messages" DisplayMemberBinding="{Binding Path=ErrorMessages}"
                                            sorter:GridViewSort.PropertyName="ErrorMessages" Width="Auto"/>
                        </GridView>
                    </ListView.View>
                </ListView>

My problem is with the first and last columns. They are not automatically resizing to fit the contents of the data. I could use a fixed width, but that will cause problems later in the project when I let users adjust font size.

Every solution I've found seems to be to set the width="auto" and WPF will do this for you. However, it doesn't do it. So as a bit of a newbie at WPF, I'm not sure what to do.