WPF中弹出菜单

    <Grid>
        <Button x:Name="BtnPop" Width="100" Height="30" HorizontalAlignment="Left" VerticalAlignment="Bottom" Content="Popup" Click="BtnPop_Click"/>
        <Popup x:Name="Pop" PopupAnimation="Slide" Width="100" Height="100" PlacementTarget="{Binding ElementName=BtnPop}" Placement="Top" AllowsTransparency="True" StaysOpen="False">
            <Border Background="#FFCFCFCF" CornerRadius="5" BorderBrush="#FF000000" BorderThickness="1">
                <StackPanel Margin="5">
                    <Button Content="A" Margin="5"/>
                    <Button Content="B" Margin="5"/>
                    <Button Content="C" Margin="5"/>
                </StackPanel>
            </Border>
        </Popup>
        
    </Grid>