public PropertyGroup getPropertyGroup(String basename, int index)
   {
      String name = makeIndexPropertyName(basename, index);
      return getPropertyGroup(name);
   }
public PropertyGroup getPropertyGroup(String basename, int index)
   {
      String name = makeIndexPropertyName(basename, index);
      return getPropertyGroup(name);
   }
public PropertyGroup getPropertyGroup ( String basename , int index ) { String name = makeIndexPropertyName ( basename , index ) ; return getPropertyGroup ( name ) ; }
Get a property group for the given property base at the given index.

@param basename   Base property name.
@param index      Array property index.
@return           Property group.
Get a property group for the given property base at the given index .