MainPage.xaml

<phone:PhoneApplicationPage 
    x:Class="Modulo6.Actividad2.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="696"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <Grid x:Name="LayoutRoot" Background="{StaticResource boardBrush}">
        <Grid.Resources>
            <DataTemplate x:Key="ListaNotasTemplate">
                <StackPanel Orientation="Horizontal">
                    <Image Source="/Images/pin.png" Margin="10"/>
                    <TextBlock Text="{Binding Titulo}" FontSize="30" VerticalAlignment="Center"/>
                </StackPanel>
            </DataTemplate>

        </Grid.Resources>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <!--<TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/>-->
            <TextBlock x:Name="PageTitle" Text="Notas" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>

        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <ListBox Name="lbNotas" ItemsSource="{Binding Source={StaticResource miPizarra}, Path=Notas}" ItemTemplate="{StaticResource ListaNotasTemplate}" SelectionChanged="lbNotas_SelectionChanged"></ListBox>
        </Grid>
    </Grid>

    <phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton IconUri="/Images/appbar.add.rest.png" Text="Agregar" Click="ApplicationBarIconButton_Click" />
            <shell:ApplicationBarIconButton IconUri="/Images/appbar.edit.rest.png" Text="Editar" Click="ApplicationBarIconButton_Click_1" IsEnabled="False" />
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>

</phone:PhoneApplicationPage>