Generates a symmetry map. Symmetry maps establish correspondence between points on either side of a geometrical object for symmetrical manipulation.
To apply: Select an object and choose Get 
Property Symmetry Map from any toolbar.
To redisplay: Select the object, click the Selection button on the Select panel, expand the Clusters\SymmetryMapCls\<symmetry_map_name> node, then click the Symmetry Map Generator icon.
