When the Slider ControlTemplate is edited in Blend, the ticks of the control are not displayed.

Workaround:
The ItemsSource and ItemTemplateSelector of the RadTickBar controls "BottomTickBar" and "TopTickBar" is not set in the extraction process. To workaround this, set these two properties of TickBars and the ticks will be displayed ", for instance:
ItemsSource="{TemplateBinding ResultTicks}" and ItemTemplateSelector="{TemplateBinding TickTemplateSelector}".

Reason for closed:
This is an issue, that has been reported to Microsoft on several occasions (for example here: https://connect.microsoft.com/VisualStudio/feedback/details/677461/msdn-forum-the-value-of-itemscontrol-itemssource-is-missing-in-the-extracted-template )  and it is not scheduled to be fixed.