<ListView SelectionMode="Multiple" HorizontalAlignment="Stretch">
        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Setter Property="IsSelected" Value="True"/>
            </Style>
        </ListView.ItemContainerStyle>
        <TextBox Width="200"/>
        <TextBox Width="200"/>
        <TextBox Width="200"/>
        <TextBox Width="200"/>
        <TextBox Width="200"/>
    </ListView>

<ListView SelectionMode="Multiple">
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            <Setter Property="ContentTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <ListViewItem  IsSelected="True" >
                            <TextBox Height="30" Width="200" ></TextBox>
                        </ListViewItem>
                    </DataTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </ListView.ItemContainerStyle>
    <TextBox />
    <TextBox/>
    <TextBox/>
    <TextBox/>
    <TextBox/>
</ListView>