Double-wrapping Windows8 grid view - microsoft-metro

Question

I'm working on a Windows 8 application and i have to create a different-sized tiles view. An issue is that i need my view to be double-wrapped: first, it should be wrapped horizontally (ie, each column should be 2 tiles in width). Such a view is going to be a very tall column. Next, it should wrap vertically.
The sketch of a view i'm going to create is given below. Are there any Win8 controls able to provide the described behavior ?
I've tried to use VariableSizedWrapGrid, but it seems it's unable to double-wrap it.

Answer 1

Ok, the time has passed and i've got no better solution than creating a custom columned model and using a grid with few VariableGridViews (one VariableGridViews per column).
Maybe, my XAML will help somebody.
<controls:VariableGridView ItemsSource="{Binding Columns}">
<controls:VariableGridView.ItemTemplate>
<DataTemplate>
<controls:VariableGridView ItemsSource="{Binding Tiles}">
<controls:VariableGridView.ItemTemplate>
<DataTemplate>
<Grid VariableSizedWrapGrid.ColumnSpan="{Binding Width}">
<Rectangle Fill="Red" Width="{Binding WidthPixels}" Height="{Binding HeightPixels}"></Rectangle>
</Grid>
</DataTemplate>
</controls:VariableGridView.ItemTemplate>
<controls:VariableGridView.ItemsPanel>
<ItemsPanelTemplate>
<VariableSizedWrapGrid VerticalAlignment="Center"
ItemHeight="150"
ItemWidth="150"
MaximumRowsOrColumns="2"
Orientation="Horizontal" Height="768"
AllowDrop="True"
Tapped="VariableSizedWrapGrid_Tapped"/>
</ItemsPanelTemplate>
</controls:VariableGridView.ItemsPanel>
</controls:VariableGridView>
</DataTemplate>
</controls:VariableGridView.ItemTemplate>
</controls:VariableGridView>
Model source code looks like (truncated)
public class TilesCollection
{
public ObservableCollection<ITile> Tiles {get; private set;}
}
public class ColumnedListModel
{
ObservableCollection<TilesCollection> m_columns = new ObservableCollection<TilesCollection>();
public ObservableCollection<TilesCollection> Columns
{
get
{
return m_columns;
}
}
// ....
}