Hi,
The only workaround seems to be using custom graphics. You might want to take a look at the knowledgebase linked below for more information about custom graphics in Lookout.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/92eb0d988476c4f686256cb6005ec259?OpenDocument
Best Regards,
Remzi A.