title: name of skill function get list of master children layout cells used in current design
body: <p>Does Cadence Virtuoso have a skill function to get  list of master children layout cells used in current design?</p>
  
  <p>I've tried to work with </p>
  
  <p>ddGetObjChildren</p>
  
  <p>but this function returns children of datatypes for my top cell: schematic, abstract , etc.
  I need list of layout children masters used in this top cell.</p>