LabVIEW 7.0 supports exporting a picture control to a , which can be saved to bitmap. However, in LabVIEW 6.1 on option is to use the "Get Image" VI Server Method. This gets an image of the FP control, so you will need to which you can then remove the border. Take a look at...
http://labview.brianrenken.com/downloads.shtm
There is a tool available there, that does basically this.
-Jim