Vertical scrolling inside GridView group of items in WinRT XAML

OK, I finally solved it! To whom it may concern:

<GroupStyle.ContainerStyle>    <Style TargetType="GroupItem">        <Setter Property="Template">        <Setter.Value>            <ControlTemplate TargetType="GroupItem">                <Grid>                    <Grid.RowDefinitions>                        <RowDefinition Height="Auto"/>                        <RowDefinition Height="*"/>                    </Grid.RowDefinitions>                    <ContentPresenter Content="{TemplateBinding Content}" Grid.Row="0"/>                    <ItemsControl x:Name="ItemsControl2" ItemsSource="{Binding GroupItems}" Grid.Row="1">                        <ItemsControl.Template>                        <ControlTemplate>                            <ScrollViewer x:Name="ScrollViewer" VerticalScrollBarVisibility="Hidden"                                                  VerticalScrollMode="Enabled" HorizontalScrollBarVisibility="Disabled"                                                  HorizontalScrollMode="Disabled">                            <ItemsPresenter />                            </ScrollViewer>                        </ControlTemplate>                        </ItemsControl.Template>                    </ItemsControl>                </Grid>           </ControlTemplate>       </Setter.Value>       </Setter>   </Style></GroupStyle.ContainerStyle>

It's important that you use the Grid to make sure that the ScrollViewer scales correctly.

What about this?

It renders elements like this:
Item 1 Item 2
Item 3 Item 4

<ListView Width="200">    <ListBoxItem>        <TextBlock>Item 1</TextBlock>    </ListBoxItem>    <ListBoxItem>        <TextBlock>Item 2</TextBlock>    </ListBoxItem>    <ListBoxItem>        <TextBlock>Item 3</TextBlock>    </ListBoxItem>    <ListBoxItem>        <TextBlock>Item 4</TextBlock>    </ListBoxItem>    <ListView.ItemsPanel>        <ItemsPanelTemplate>            <WrapGrid Orientation="Horizontal"/>        </ItemsPanelTemplate>    </ListView.ItemsPanel></ListView>

I would place your elements inside a scroll viewer directly. Like this:

<GroupStyle.Panel> <ItemsPanelTemplate>      <ScrollViewer VerticalScrollBarVisibility="Visible" HorizontalScrollMode="Disabled" ZoomMode="Disabled" VerticalScrollMode="Enabled">            <StackPanel Orientation="Vertical" Visibility="Visible" />      </ScrollViewer> </ItemsPanelTemplate>

I hope this helps,Lance