Problem with binding

Hi there,

I've a small problem regarding binding.

I have a ViewModel with 2 properties: ObservableCollection Comments and string Title.

My listview looks as following: <ListView x:Name="listView" ItemsSource="{Binding Comments}" HasUnevenRows="true">

This works great.. now the next thing I would like to do is access my Title inside a ViewCell. I tried:
{Binding Title}

But this this doesn't work. What am I doing wrong here?