Hi,
Please check out the following link that discusses the customization of LabVIEW Controls and Indicators.
http://zone.ni.com/devzone/conceptd.nsf/webmain/A9FBCAA7A3D7922186256A3000652B56?opendocument#7
Also, I read through the above document and created a meter indicator with rounded edges(see attched image).
Regards,
Ankita A.
Applications Engineer
National Instruments