Closed Corner using aerospace flanges - NX8.5

[Jbreed300]

Hello,

I'm trying to figure out how to extend the start and end of an aerospace flange in a similar manner to the SB Closed Corner.

I tried using the start/end planes in the flange dialog, but that would only allow me to trim the part, not extend it, even if I selected a plane that was outside the flange area.
Seems like closed corner would work great, but it won't let me select the bend area of an Aerospace flange.

Any ideas?

Thanks,

Jeff