Controls named inside an item template can't be referenced in the code-behind file.

Hi there,
I'm having an issue where in XAML I define a ListBox with a ListBox.ItemTemplate property element. I put an Image control in the template with a name "envelopeImage" but IntelliSense won't show it to me in the code-behind file (in C#). Is there another way to access the Image? I need to set the source to an embedded resource (namely an image of an envelope). Thanks!

<ListBox HorizontalContentAlignment="Stretch" ItemsSource="{Binding Path=myItems}" Margin="10" Name="newItemsListBox">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <Border BorderBrush="Blue" BorderThickness="3">
                                <Grid>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="2*" />
                                        <RowDefinition Height="6*" />
                                        <RowDefinition Height="2*" />
                                    </Grid.RowDefinitions>
                                    <StackPanel Grid.Row="0" Orientation="Horizontal">
                                        <Image Name="envelope" />
                                        <!--...-->
                                    </StackPanel>
                                    <!--...-->
                                </Grid>
                            </Border>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>

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