[PyMOL] molecular surface area

[amna k. <amn...@gm...>]

 hi

can anyone tell me, how can i caluclate the molecuar surface area for just
 interacting protein -ligand structure, not for whole protein.?????

when i do this
first i hide the protein non-interacting part then

  by clicking A --> COMPUTE --> SURFACE--> MOLECULAR,
no surface area is generated with transpracy 0.5
regards

amna khan