The result I want to achieve is pretty simple, a list with 2 columns, both with equal width. In Windows Phone 7/8 this could easily be achieved using a `ListBox` with a `WrapPanel` as `ItemsPanel` and setting the `ItemWidth` to 240 (as the screen width was 480).

Now I'm Writing a Universal App, but here the problem is that the screen is not guaranted to have a width of 480 (not even for the Phone it seems) so I can't set the `ItemWidth` as I want it to fill the width of the screen. I have been able to achieve almost the desired effect using the following `XAML`:

```
<GridView ItemsSource="{Binding Results}" Margin="12">
    <GridView.ItemTemplate>
        <DataTemplate>
            <Grid>
                <Image Source="{Binding SampleImage}" />
            </Grid>
        </DataTemplate>
    </GridView.ItemTemplate>

    <GridView.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapGrid MaximumRowsOrColumns="2" Orientation="Horizontal" HorizontalChildrenAlignment="Stretch" VerticalChildrenAlignment="Stretch">
            </WrapGrid>
        </ItemsPanelTemplate>
    </GridView.ItemsPanel>
</GridView>

```

Which gives the following result:
![enter image description here](https://i.stack.imgur.com/iXIvL.png)

As seen it successfully gives 2 columns with equal width, BUT the `Grid` in the `GridView.ItemTemlate` doesn't fill the whole width of each column. I have tried setting `HorizontalAlignment="Stretch"` on both that `Grid` and on the `GridView` itself witout any success. Anyone has any idea of this do this?