PopUp control does not move with the Window, while moving the window after we resize it

Question

I am facing one issue with the WPF popup control.
When we resize the window and move it, PopUp control remains at same position at which it was open previously and does not move with the window.
So what is the solution for this issue. please provide code snippet for the solution if any. Thanks :)

Xaml code for popup control is as follows:

<Popup x:Name="popNonTopMostPopup" Height="200" Width="220" AllowsTransparency="True" Placement="Right">
            <Grid Background="Transparent">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="20" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <fa:FontAwesome Grid.Column="0" Icon="Play" FontSize="30" HorizontalAlignment="Right" Rotation="180" VerticalAlignment="Top" Margin="0 7 -2 0" />
                <Border Grid.Column="1" BorderBrush="LightGray" Background="Black" CornerRadius="5" Height="200" Width="200">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <Button x:Name="btnCustomPopup" Click="btnCustomPopup_Click" HorizontalAlignment="Right" Background="Transparent" Foreground="LightGray" BorderBrush="Transparent" Grid.Row="0">
                            <StackPanel Margin="0">
                                <fa:FontAwesome Icon="Close" VerticalAlignment="Center" />
                            </StackPanel>
                        </Button>
                        <Label x:Name="lblName" Grid.Row="1" Foreground="LightGray"/>
                        <Grid Grid.Row="2">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <Label x:Name="lblDueDate" Foreground="LightGray" Content="Fristdatum: " Grid.Column="0" VerticalAlignment="Bottom" Visibility="Hidden"></Label>
                            <TextBlock x:Name="txtDueDate" Foreground="LightGray" HorizontalAlignment="Left" Grid.Column="1" VerticalAlignment="Center" Visibility="Hidden"></TextBlock>
                        </Grid>
                        <Separator Grid.Row="3"></Separator>
                        <TextBlock x:Name="txtComments" Foreground="LightGray" TextWrapping="WrapWithOverflow" Grid.Row="4" Margin="10 10 10 10"></TextBlock>
                    </Grid>
                </Border>
            </Grid>
        </Popup>

We have icons on map on click of which pop up control is displayed.Code for click event is as follows.

void pin_MouseLeftButtonDownForOrder(object sender, MouseButtonEventArgs e)
{
      // set the placement target of popup as pin mapicon
      popNonTopMostPopup.PlacementTarget = orderIcon;
      popNonTopMostPopup.IsOpen = true;
}