save as DXF in Sheet Metal...PROBLEM !

I am making sheet metal ribs for an aircraft and when I usethe "flatten" button to make a flatpattern, none of the fillets ormodifications that I do in the "flattened" state will be exportedout when I do a "save as DXF". Sometime the "flatten" buttondoesn't quite do some edges the way I want it to so I have tomodify the flat pattern after the fact. I can put the flat patternon a drawing and then do a "save as DXF" and it works great, butthat is an extra step that I would like not to have to do. I hope Iexplaned this enough for everyone.

Thanks...SolidworksSheet Metal