Archivo XAML para interfaz de la aplicación de notas para Windows 10.

MainPage.xaml

<Page
    x:Class="NotasApp.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:NotasApp"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" RenderTransformOrigin="0.5,0.5" UseLayoutRounding="False">
    <Page.RenderTransform>
        <CompositeTransform/>
    </Page.RenderTransform>
    <RelativePanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <TextBox x:Name="txtTitulo" TextWrapping="Wrap" Text="" Margin="10,10,-710,-79"
                 PlaceholderText="Titulo"
                 FontSize="18.667"/>
        <RichEditBox Margin="10,84,-710,-224"
                     PlaceholderText="Nota" 
                     FontSize="18.667"
                     Name="txtNota"/>
        <Button x:Name="btnCrear" 
                Content="Crear Nota" 
                HorizontalAlignment="Right"
                VerticalAlignment="Bottom" 
                Height="67" Margin="0,0,-710,-304"
                Width="701" FontSize="21.333"
                Click="btnCrear_Click"/>
        <ScrollViewer Margin="10,322.433,-710,-764.224">
            <ListView x:Name="lista" Height="441.791" Width="700"/>
        </ScrollViewer>
    </RelativePanel>
</Page>