title: How to fit textbox width with a set of columns in a grid?
body: <p>Supose I have a grid with 4 columns and want to put a textbox in the second column and span it to the last column. How could I fit the textbox width to be as wide as the 3 last columns?</p>
  
  <p>I have tried something with Borders, but it didn't work.</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;Grid&gt;
        &lt;Grid.ColumnDefinitions&gt;
             &lt;ColumnDefinition Width="Auto" /&gt;
             &lt;ColumnDefinition Width="Auto" /&gt;
             &lt;ColumnDefinition Width="Auto" /&gt;
             &lt;ColumnDefinition Width="Auto" /&gt;
        &lt;/Grid.ColumnDefinitions&gt;
  
        &lt;TextBox Grid.Column="1" Grid.ColumnSpan="3" /&gt;
  &lt;/Grid&gt;
  </code></pre>