I have a problem understanding one style definition in Windows 8 metro apps.

When you create a metro style application with VS, there is also a folder named

Common

created. Inside this folder there is file called

StandardStyles.xaml

Now the following snippet is from this file:

<!-- Grid-appropriate 250 pixel square item template as seen in the GroupedItemsPage and ItemsPage -->
<DataTemplate x:Key="Standard250x250ItemTemplate">
    <Grid HorizontalAlignment="Left" Width="250" Height="250">
        <Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}">
            <Image Source="{Binding Image}" Stretch="UniformToFill"/>
        </Border>
        <StackPanel VerticalAlignment="Bottom" Background="{StaticResource ListViewItemOverlayBackgroundThemeBrush}">
            <TextBlock Text="{Binding Title}" Foreground="{StaticResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextStyle}" Height="60" Margin="15,0,15,0"/>
            <TextBlock Text="{Binding Subtitle}" Foreground="{StaticResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/>
        </StackPanel>
    </Grid>
</DataTemplate>

What I do not understand here is the static resource definition, e.g. for the Border

Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}"

It is not about how you work with templates and binding and resources.

Where is this ListViewItemPlaceholderBackgroundThemeBrush located?

Many thanks for your help.

Dimi