WPF ListBox scrollbar is not working

Question

<ListBox Name="myListBx" ItemsSource="{Binding Collection}" Margin="5,5"
    SelectedValuePath="ColId"
    SelectedValue="{Binding Path=ColId}"
    SelectionMode="Multiple"
    BorderThickness="0" Background="{x:Null}" BorderBrush="{x:Null}"
    ScrollViewer.VerticalScrollBarVisibility ="Auto">
    <ListBox.ItemTemplate>
        <DataTemplate>
            // blabla
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

My ListBox contains so many elements and actually the scrollbar should work but it's not even visible. Am I doing something wrong?

Thanks

Solution

You need to put the ListBox in a Grid. The StackPanel has an
infinite height, so that the ScrollBar does not get enabled or visible.

<Grid>
  <ListBox VerticalAlignment="Stretch" />
</Grid>

Comments

[Stacked]

Works fine! Thank you Jehof