<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
  <Grid>
    <StackPanel>
      <TextBlock Name="tbNomAlum" />
      <ListBox Name="listaAsigs"/>
    </StackPanel>
  </Grid>
</Window>
