false XAML error

Hi,

ReSharper 4.5 says, that the following XAML-line contains an error:

<TabControl Grid.Column="1" DataContext="{Binding Verträge/}">

It says, that after the last slash is a "property expected", but the binding code is correct.
Is this a bug or is there an option for setting something up in this way?

Thanks for your answers
Sascha