First of, let me apologize for the inconvenience caused. During Q2 we entirely changed the Slider default ControlTemplate (Style) to introduce major improvements in the templating mechanism.
As a result, the control allows easier customization and maintenance with non-default themes and ControlTemplates. It underwent a major refactoring, which also resolved the current issues and limitations. Please be aware that the newly introduced style will cause some backwards incompatibility issues for users who already use custom styles. Not to worry though, for those users we will provide the needed assistance and resources for migrating to the new version.
The EnableSideTicks property is no longer property if RadTickBar but of RadSlider. You can simply delete the property.
More information on the new structure of RadSlider can be found here
Let us know if you need assistance updating your old style to the new one. We'd be glad to further assist you.
the Telerik team
Register for the Q2 2011 What's New Webinar Week. Mark your calendar for the week starting July 18th and book your seat for a walk through of all the exciting stuff we will ship with the new release!