button.xaml

                    <Button VerticalAlignment="Center" Style="{StaticResource HyperlinkButton}" Content="{Binding SelectedMonth.Month}">

                        <Button.ContextMenu>

                            <ContextMenu DataContext="{Binding PlacementTarget, RelativeSource={RelativeSource Self}}">
                                
                                <ContextMenu.Resources>

                                    <Style TargetType="MenuItem" BasedOn="{StaticResource MetroMenuItem}">

                                        <Setter Property="Header" Value="{Binding Month}" />
                                        <Setter Property="Command" Value="{Binding RelativeSource={RelativeSource AncestorType=DockPanel}, Path=DataContext.CmdFetchConversationByMonth}"/>
                                        <Setter Property="CommandParameter" Value="{Binding}"/>

                                    </Style>

                                </ContextMenu.Resources>

                                <ContextMenu.ItemsSource>
                                    <CompositeCollection>
                                        <CollectionContainer Collection="{Binding Source={StaticResource Months}}" />
                                    </CompositeCollection>
                                </ContextMenu.ItemsSource>

                            </ContextMenu>

                        </Button.ContextMenu>