do you want a solid or a surface?
if you want a surface, use the EXTRUDE icon (GSD workbench) and select one or more of the wireframe lines/curves.
if you want a solid, make a sketch (in the same plane as your 2D wireframe) and PROJECT the wireframe into the sketch. now you use the sketch for a pad.
another method to make a solid, is to use JOIN to connect all the wireframes lines/curves into a single, closed 'polyline', and then make the pad from that.