andersonimes

private bool IsDesignMode {
    get {
        DependencyProperty isDesignModeProperty = (DependencyProperty)AppDomain.CurrentDomain.GetData(“IsDesignModeProperty”);
        return isDesignModeProperty == null ? false : true.Equals(isDesignModeProperty.GetValue(this));
    }
}

andersonimes

        <ItemsControl Grid.IsSharedSizeScope="True">
            <ItemsControl.ItemTemplate>
                <DataTemplate DataType="HeaderedContentControl">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition SharedSizeGroup="Labels" />
                            <ColumnDefinition SharedSizeGroup="Inputs" />
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Text="{Binding Header}" />
                        <ContentControl Grid.Column="1" Content="{Binding Content}" />

andersonimes

<ItemsControl ItemsSource="{Binding StuffThatIsCool}">
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding WhyCool}" />
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>