title: Can't edit Textblock content in WPF
body: <p>I'm working on my first WPF application and I notice that I'm not able to edit the text values in any of my textblocks.</p>
  
  <p>I can't seem to find anything wrong here that would prevent me from changing it...</p>
  
  <pre><code>&lt;Label Content="Line Terminator" Grid.Row="0" Grid.Column="0" Margin="5"&gt;&lt;/Label&gt;
  &lt;Border BorderThickness="1" BorderBrush="LightBlue" Grid.Row="0" Grid.Column="1" Margin="5"&gt;
      &lt;TextBlock x:Name="txtLineTerm" Focusable="True" IsManipulationEnabled="True" Padding="3"&gt;&lt;/TextBlock&gt;
  &lt;/Border&gt;
  &lt;Label Content="Field Terminator" Grid.Row="0" Grid.Column="2" Margin="5"&gt;&lt;/Label&gt;
  &lt;Border BorderThickness="1" BorderBrush="LightBlue" Grid.Row="0" Grid.Column="3" Margin="5"&gt;
      &lt;TextBlock x:Name="txtFieldTerm" Focusable="True" IsManipulationEnabled="True" Padding="3"&gt;&lt;/TextBlock&gt;
  &lt;/Border&gt;
  </code></pre>
  
  <p>Can anyone see the problem? I feel like there's a concept that I'm missing here. Any explanation will be greatly appreciated.</p>