How to put image “placemarkers” inside a scrollbar in WPF?

Question

I have a long Scroll Viewer and I want to mark important spots with small images on the scroll bar. If the the image is clicked the scroll bar will jump to the corresponding con

Answer 1

To contribute to japfs answer: I solved the update on resize issue: You can use japfs Style and apply a ItemsSource to the ItemControl:

ItemsSource="{Binding Positions, UpdateSourceTrigger=PropertyChanged}"

Just make sure Positions is of type ObservableCollection and the positions are recalculated in SizeChanged-event. Additionally in that event call (INotifyPropertyChanged interface which should your ViewModel implement)

OnPropertyChanged("Positions");

Tried it with a List first, but that did not update correctly. Worked with ObservableCollection just fine.