<ListView.GroupStyle>
                        <GroupStyle>
                            <GroupStyle.HeaderTemplate>
                                <DataTemplate>
                                <TextBlock Text="{Binding Key}" Foreground="CadetBlue" FontSize="18" />
                                </DataTemplate>
                            </GroupStyle.HeaderTemplate>
                        </GroupStyle>
                    </ListView.GroupStyle>

                    <ListView.ItemContainerStyle>
                        <Style TargetType="ListViewItem">
                            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                        </Style>
                    </ListView.ItemContainerStyle>

                    <ListView.Resources>
                        <MenuFlyout x:Name="MenuFlyoutContext" x:Key="FlyoutBaseKey">
                            <MenuFlyoutItem x:Name="MFSubMenu1" x:Uid="MenuFlyoutModif" Click="MFSubMenu1_Click"/>
                            <MenuFlyoutItem x:Name="MFSubMenu2" x:Uid="MenuFlyoutDelete" Click="MFSubMenu2_Click"/>
                        </MenuFlyout>
                    </ListView.Resources>

                    <FlyoutBase.AttachedFlyout>
                        <StaticResource ResourceKey="FlyoutBaseKey"/>
                    </FlyoutBase.AttachedFlyout>

                </ListView>