Thank you for using our services.
You are getting this behavior, because you the SiteMapDataSource control needs to be initialized before the SitePanleBar control. If your Panel Bar control is put before the SiteMapDataSource
it will get initialized before the SiteMapDataSource and will not be able to find the control.
Can you open your template for editing, and in the ContentPlaceHolder where you have the controls just drag the SitePanelBar to be bellow the SiteMapDataSource control. So when the page is rendered SiteMapDataSource will get
This should do the trick. If you have more questions, please feel free to contact us.
the Telerik team