How do I get find my “CheckBox” item that is in the ItemTemplate?

Question

I have the following (very simple) ItemsControl:

Answer 1

Here's an example of capturing a container that houses your ItemsControl's item:

       CheckBox checkbox = sender as CheckBox;

        foreach (var item in MembersItemsControl.Items)
        {
            var container = 
MembersItemsControl.ItemContainerGenerator.ContainerFromItem(item) as FrameworkElement;

            UserInformation user = container.DataContext as UserInformation;

            bool isMale = true;
            if (user.sex == isMale && checkbox.IsChecked.Value == true)
            {
                container.Visibility = System.Windows.Visibility.Visible;
            }
        }

I hope that helps.