How to stretch the width of ListView elements to fill the parent container?

Question

How to stretch the width of list items to fill the parent container?

The default behavior seems to compress everything as narrow as possible.

Answer 1

The problem is not the child, but the item container, which has HorizontalAlignment = Left, hidden somewhere deep inside the frame code. Only after fixing this will you get the behavior that you would expect by default.

<ListView.ItemContainerStyle>
  <Style TargetType="ListViewItem">
    <Setter Property="HorizontalContentAlignment" Value="Stretch" />
  </Style>
</ListView.ItemContainerStyle>

<GroupStyle.HeaderContainerStyle >
  <Style TargetType="ListViewHeaderItem">
    <Setter Property="HorizontalContentAlignment" Value="Stretch" />
  </Style>
</GroupStyle.HeaderContainerStyle>