can you explain why it is necessary for a shape to be detached from the resulting shape when for example it is extruded. ie: draw a circle and extrude, the original circle is not part of the result so editing the extrude is restricted to the 2D co-ordinates the shape was drawn in and the control points are lost during modelling operations. It would be awsome if their was a way to edit in the 3rd. axis and retain the capped extrude. instead when edited in the 3rd. the caps dissappear.