How do I access ListBox DataContext from Inner ListBoxItem ControlTemplate

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C#

Windows

XAML

WPF

Hi.
I have a ListBox with a ControlTemplate for the ListBoxItems. The ListBox is bound to an ObservableCollection inside a viewmodel. What i'm trying to do is access the viewmodel associated to the LisBox from inside the ListBoxItem Control Template.

EXAMPLE.

Here is my viewmodel:

public class MainViewModel : INotifyPropertyChanged
{
    ...

    public string SampleText { ... }
    public ObservableCollection<string> Collection { ... }

    ...
}

And the View:

<UserControl ...>
    <Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource MainViewModelDataSource}}">
        <ListBox Height="200" Width="600" ItemContainerStyle="{DynamicResource MyListBoxItemStyle}" ItemsSource="{Binding Collection}">
        </ListBox>
    </Grid>
</UserControl>

"MyListBoxItemStyle" Definition:

<Style x:Key="MyListBoxItemStyle" TargetType="{x:Type ListBoxItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                <Grid>
                    <ContentPresenter HorizontalAlignment="Left" Height="Auto" VerticalAlignment="Top" Width="Auto"/>
                    <TextBlock x:Name="sampleTextBlock" HorizontalAlignment="Right" TextWrapping="Wrap" Text="Sample" VerticalAlignment="Top"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Well. I want to bind the "sampleTextBlock" Text Property to the MainViewModel.SampleText property. But what is bound to the ListBoxItem is a string because of the ObservableCollection<string>. I think maybe exists a way to access the ListBox DataContext (MainViewModel in this case) from within the ListBoxItem Control Template. Something like Text={Binding SampleText, Source={...}}

Thanks in advance.