Question

I have a PivotControl that contains ListBox elements:

<controls:Pivot Title="SECTIONS" x:Name="pivotControl" ItemsSource="{Binding SectionViewModels}">
            <controls:Pivot.HeaderTemplate>
                <!-- -->
            </controls:Pivot.HeaderTemplate>
            <controls:Pivot.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <!-- if you don't explicitly specify the height, the scrolling won't work -->
                        <ListBox ItemsSource="{Binding StoryViewModels}" SelectionChanged="StoryList_SelectionChanged"
                                 Height="625" u:ScrollViewerMonitor.AtEndCommand="{Binding ElementName=LayoutRoot, Path=DataContext.FetchMoreDataCommand}">
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <local:StoryControl />
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>

                    </StackPanel>
                </DataTemplate>
            </controls:Pivot.ItemTemplate>
        </controls:Pivot>

I want to get and set the ScrollViewer.VerticalOffset of a ListBox corresponding to a given SectionViewModel (which is the item source of the pivot control). How can I do this?

Answer 1

There’re some cases that you need to access view elements. For those cases using the VisualTreeHelper is the solution. You can find a summary of it in my blog and some helper extension methods.

I recommend to use SilverlightSpy to see how the VisualTree is composed at runtime and be able to more efficiently navigate it.