Thanks for writing back.
Indeed, you are right. I have checked the behavior both in Zune and also in the Phonebook app of WP7 and when the user reaches the top end of the scrollable list, the sticky header is hidden. We will try to improve the behavior of our control in this scenario.
I would also like to make some notes here. As we are using the ScrollViewer'
manipulation mode (the optimization Microsoft
introduced in WP7.5 to improve scrolling performance) we do not have a direct control to the animation used when scrolling items. This animation is both started and performed off-thread and the properties (like VerticalOffset etc.) on the UI-thread are not updated regularly. This prevents us from tracking animations in a pixel perfect manner and thus update the sticky header exactly when the first item header appears on the screen.
We will anyway do our best to improve the behavior of RadJumpList
Thanks for your feedback.
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>