How can I change listbox item's visibility property in wp7?

Question

For example: there is a listbox:

Answer 1

The ListBoxgenerates a container of type ListBoxItem for each item. You can access it as follows:

ListBoxItem lbi = lb.ItemContainerGenerator.ContainerFromIndex(0) as ListBoxItem
lbi.Visibility = Visibility.Collapsed;

If you want access to the TextBlock you will need to navigate the visual tree of the ListBoxItem. For example, using Linq to VisualTree:

TextBlock txt = lbi.Descendants<TextBlock>().Single() as TextBlock;