title: Prevent a container to resize because of its children
body: <p>I have a Border in a grid row (margin="5"). This grid row is supposed to take all available space.</p>
  
  <p>When I execute my program, it works well: I see the border occupying all available space on the window when I manually resize it.</p>
  
  <p>However, if I add a datagrid in the border and this datagrid has many items (thus it has an important height), my border and subsequently my grid row's height adapts.</p>
  
  <p>I've tried to set the datagrid VerticalAlignment to stretch, to no avail. </p>
  
  <p>How can I achieve this please?</p>