2 DataTemplates within each other, Command not found - xaml

Question

My ICommand is not firing when i touch my button...
I have a DataTemplate within a DataTemplate... does DataContext still refer to the entire page or is it that DataContext refers to the previous DataTemplate and that's why it cannot find my view model's ICommand?
<phone:LongListSelector.ItemTemplate>
<DataTemplate>
<StackPanel VerticalAlignment="Top">
<Border BorderThickness="0 0 0 2" BorderBrush="{StaticResource xLightGray}" Margin="0,0,0,10" Padding="0,0,0,10">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="40"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<StackPanel Grid.Column="0" Background="Transparent">
<Border Background="White" BorderThickness="0" Width="40" Height="40" HorizontalAlignment="Left">
<Image Source="{Binding image.thumbnail_link}" Width="40" Height="40"></Image>
</Border>
</StackPanel>
<StackPanel Grid.Column="1" VerticalAlignment="Center" Background="Transparent">
<TextBlock Text="{Binding name}" HorizontalAlignment="Left" FontSize="30" VerticalAlignment="Center" Padding="10,0,0,0" />
</StackPanel>
</Grid>
</Border>
<phone:LongListSelector x:Name="OrganisationItemList"
Background="Transparent"
ItemsSource="{Binding spaces}"
LayoutMode="List"
VerticalContentAlignment="Stretch">
<phone:LongListSelector.ItemTemplate>
<DataTemplate>
<Button Background="Red" Style="{StaticResource xTransparentButton}" Command="{Binding Path=DataContext.LoadSpaceCommand, ElementName=SpaceList}" CommandParameter="{Binding}" Padding="0,0,0,5" Margin="0" Height="auto" BorderThickness="0" HorizontalAlignment="Left" VerticalAlignment="Stretch" HorizontalContentAlignment="Left" UseLayoutRounding="True" FontSize="0.01">
<StackPanel Grid.Column="1" VerticalAlignment="Center" Background="Transparent">
<TextBlock Padding="0,0,0,0" Text="{Binding name}" HorizontalAlignment="Left" FontSize="{StaticResource xFontSize}" />
</StackPanel>
</Button>
</DataTemplate>
</phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>
</StackPanel>
</DataTemplate>
</phone:LongListSelector.ItemTemplate>

Answer 1

Found the answer, you must set ElementName in the binding to the parent ListBox:
Command="{Binding Path=DataContext.LoadSpaceCommand, ElementName=OrganisationList}"