WP7 ListBox Scrolling Not Working

Question

I have the following XAML markup in a WP7 UserControl. My problem is that when my ListBox has more items than will fit on a page it will not scroll properly. I can scroll the list by panning upwards with my finger but as soon as I remove my finger it jumps back to the top of the list (if the list is very long then the scrolling will not even work to this limited extent).

I have tried numerous different layouts with no success eg Wrapping ListBox in ScrollViewer, utilising StackPanel instead of Grid, removing the WrapPanel and replacing it with a grid.

Other similar questions suggested removing StackPanel (which I did but made no difference) or using ScrollViewer (which did not work).

The Page that hosts the UserControl uses a GestureListener - I removed that and it still made no difference.

<Grid x:Name="LayoutRoot"
      Background="SteelBlue">

    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>

    <!--<TextBlock Grid.Row="0"
               Text="Search"
               Style="{StaticResource PhoneTextTitle2Style}" />-->

    <Grid Grid.Row="0">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <TextBlock Text="Search Type"
                   Grid.Column="0"
                   VerticalAlignment="Center" />

        <RadioButton Content="RMB/RSD"
                     Grid.Column="1"
                     IsChecked="{Binding Path=SearchType, Converter={StaticResource enumBooleanConverter}, ConverterParameter=RMB, Mode=TwoWay}" />

        <RadioButton Content="Name"
                     Grid.Column="2"
                     IsChecked="{Binding Path=SearchType, Converter={StaticResource enumBooleanConverter}, ConverterParameter=Name, Mode=TwoWay}" />
    </Grid>

    <Grid Grid.Row="1">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <TextBlock Text="Search Term"
                   Grid.Column="0"
                   VerticalAlignment="Center" />

        <TextBox Grid.Column="1"
                 Text="{Binding SearchTerm, Mode=TwoWay}"
                 InputScope="{Binding SearchTermInputScope}">
            <i:Interaction.Behaviors>
                <b:SelectAllOnFocusBehavior />
            </i:Interaction.Behaviors>
        </TextBox>

    </Grid>

    <Button Grid.Row="2"
            Content="Find"
            cmd:ButtonBaseExtensions.Command="{Binding FindDeliveryPointsCommand}" />

    <ListBox Grid.Row="3"
             ItemsSource="{Binding SearchResults}"
             ScrollViewer.VerticalScrollBarVisibility="Auto">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <toolkit:WrapPanel Orientation="Horizontal"
                                   Width="480"
                                   Background="{Binding RMB, Converter={StaticResource alternateColorConverter}}">
                    <TextBlock Text="{Binding RMB}"
                               FontSize="26"
                               Foreground="Navy"
                               Padding="5"
                               Width="60" />
                    <TextBlock Text="{Binding HouseholdName}"
                               FontSize="26"
                               Foreground="Navy"
                               Padding="5"
                               Width="420" />
                    <TextBlock Text="{Binding StreetWithRRN}"
                               FontSize="26"
                               Foreground="Navy"
                               Padding="5" />
                    <TextBlock Text="{Binding Street.Locality.Name}"
                               FontSize="26"
                               Foreground="Navy"
                               Padding="5" />
                </toolkit:WrapPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Grid>

Answer 1

Specify ListBox.Height - something like Height="200". As it is now, ListBox expands automatically to accomodate all loaded items and it grows out of the screen. As a result you get large page with no scroller.

When you add ListBox.Height, the ListBox area won't grow. Instead ListBox ScrollViewer will be activated and you'll get the effect you need.

Answer 2

I use databinding when the ListBox's Height changed depending on the other controls on the page.

<StackPanel x:Name="ContentPanel" Grid.Row="1">            
        <ListBox x:Name="LstSample" Height="{Binding ElementName=ContentPanel, Path=ActualHeight}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <Image Source="{Binding ImagePath}" Stretch="None"/>
                        <StackPanel Orientation="Vertical">
                            <TextBlock Text="{Binding Name}" FontSize="45"/>
                            <TextBlock Text="{Binding Group}" FontSize="25"/>
                        </StackPanel>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </StackPanel>