title: WPF - Why Listbox items do not fill uniformgrid
body: <p>I have a listbox with the ItemsPanelTemplate set to UniformGrid with rows= 6 and cols= 7.</p>
  
  <p>I want the listbox items to fill their space.</p>
  
  <p>I am using a datatemplete defined in a dictionary.</p>
  
  <p>The outer control of my template is a Border with HorizontalAlignment=Stretch
  and VerticalAlignent=Strectch but the templates do not fill the listbox items space?</p>
  
  <p>Any ideas?
  Malcolm</p>