Roof Wind Load

I'm analyzing a shelter made of steel tubes/pipes, that possibly will be covered by some kind of fabric all around. The structure has been modeled as a skeleton of steel tubes and is defined as enclosed for wind load calculation. While using the wind load generation feature in STAAD, I see that the load is being applied on the windward side, but i don't see corresponding loads (under the same load case) on the leeward side or on the roof, i.e., wind forces acting away from the roof or away from the leeward wall, based on the different 'zones' defined in ASCE 7-10. Am I missing an option/toggle in STAAD that would calculate these loads?