Sketchup recover deleted surface or create a new surface

I am using Google Sketchup 7 (the free version). If I select/delete a surface, like in a squre,or
cylinderical sheets, how can I add it back?  I mean the lines still there but they form a frame but no surface.

Thanks for the help
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zzhang2006ProfessorAsked:
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Rick HobbsRETIREDCommented:
I doesn't appear you can.  I was able to delete the lines and re-create the surface.
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