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c# - How to access Visibility property of the ListBoxItems

In my WPF program I have a ListBox control:

<ListBox x:Name="mailsListBox" SelectionChanged="mailsListBox_SelectionChanged" >
    <ListBoxItem Content="..." Background="#FFF3F3F3" Margin="0,0,0,1" />
    <ListBoxItem Content="...." Margin="0,0,0,1" Visibility="Hidden"/>
</ListBox>

How can I access Visibility property of the ListBoxItems? My code doesn't works:

mailsListBox.Items[1].Visibility = Visible;
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Like this:

(mailsListBox.Items[1] as ListBoxItem).Visibility = Visibility.Visible;

Or you can use ItemContainerGenerator.ContainerFromItem method:

((ListBoxItem)(mailsListBox.ItemContainerGenerator.ContainerFromItem(mailsListBox.Items[1]))).Visibility = Visibility.Visible;

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