title: Problem with ItemTemplate TextBlock
body: <p>i am trying to make an item template where some of the field in my stack panel can be empty. When it's empty, I would like to set the visiblility to collapsed. I tried putting triggers but it doesn't seem to work and I am not very familiar with this part of WPF</p>
  
  <p>Also, I would like to change the color of the background of this item when a specific value in my binding is true. Is it the same thing?</p>
  
  <p>Thanks.</p>