Edge Bends not showing in flat pattern

Hi all,

   I'm relatively new to sheet ,metal so I may be doing this the wrong way:

   I've created a slide from a base flange using edge bends.  It looks exactly as I wanted however once I flattern the part the bends withough edge flanges disappear.  Is there a way to combat this, or a better of way of modelling the slide so everything is included within the flat pattern?

Many thanks

Oli

SolidworksSheet Metal