wpf listView ghostColumn

Question

I have a wpf application where I use a listView with a gridView set as its view. It has several columns which I've customized.
The problem is they don't fill the entire listView width, as in the image below:

Below are the styles for listview and gridview column header:

<!-- 
    GridView column header
    -->
    <Style TargetType="{x:Type GridViewColumnHeader}" x:Key="style_header">
            <Setter Property="FontSize" Value="11"/>
            <Setter Property="Foreground" Value="#90969e"/>
            <Setter Property="FontWeight" Value="Light"/>
            <Setter Property="Height" Value="24"/>
            <Setter Property="IsHitTestVisible" Value="False"/>
            <Setter Property="HorizontalContentAlignment" Value="Left" />
            <Setter Property="Background">            
                <Setter.Value>
                    <ImageBrush ImageSource="/images/bg_title_table_strip.png"/>
                </Setter.Value>
            </Setter>        
            <Setter Property="BorderBrush">
                <Setter.Value>
                    <ImageBrush ImageSource="/images/black_line.png"/>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type GridViewColumnHeader}">
                        <Grid SnapsToDevicePixels="true">
                            <Border x:Name="HeaderBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="0, 1" Background="{TemplateBinding Background}">
                                <Grid>
                                    <Grid.RowDefinitions>
                                        <RowDefinition MaxHeight="7"/>
                                        <RowDefinition/>
                                    </Grid.RowDefinitions>
                                    <Rectangle x:Name="UpperHighlight" Fill="Transparent" Visibility="Collapsed"/>
                                    <Border Padding="{TemplateBinding Padding}" Grid.RowSpan="2">
                                        <ContentPresenter x:Name="HeaderContent" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="0" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                    </Border>
                                </Grid>
                            </Border>
                            <Canvas>
                                <Thumb x:Name="PART_HeaderGripper" Style="{StaticResource GridViewColumnHeaderGripper}"/>
                            </Canvas>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="true">
                                <Setter Property="Background" Value="{x:Null}"/>
                            </Trigger>
                            <Trigger Property="IsPressed" Value="true">
                                <Setter Property="Background" Value="{x:Null}"/>
                            </Trigger>
                            <Trigger Property="Height" Value="Auto">
                                <Setter Property="MinHeight" Value="20"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    <!-- 
        ListView
        -->
        <Style x:Key="style_listView"  TargetType="{x:Type ListView}">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="MinWidth" Value="1072"/>
            <Setter Property="Height" Value="686"/>
            <Setter Property="AlternationCount" Value="2"/>
            <Setter Property="Margin" Value="10,10,11,14"/>
            <!--<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled"/>-->
        </Style>

Q:  What is wrong and how can it be solved?
Any help highly appreciated.