Accessing occurrence properties from TCL script?

I have a design that incorporates hierarchical elements and was annotated using the recommended method (using occurrences).  So when I look at the the properties of say a capacitor, I see a white field with the Instance properties and a yellow field with the occurrence properties.  If I iterate over the parts on a page and call the GetReferenceDesignator method it returns the instance refDes.  Does anyone know how I would get occurrence refDes (the value that shows up in the yellow field)?  The TCL API reference is pretty sparse on details, if anyone could point me in the right direction it would be greatly appreciated.  Below is the code I am using to iterate over the parts on a page:

proc iterateParts {pageObject} {
    set lStatus [DboState]
    set lPartInstsIter [$pageObject NewPartInstsIter $lStatus]
    set refDesList []

    #initialize a Cstring variable for holding object names
    set name [DboTclHelper_sMakeCString]

    #get the first part inst
    set lInst [$lPartInstsIter NextPartInst $lStatus]
    set lNullObj NULL

    while {$lInst!=$lNullObj} {
        #dynamic cast from DboPartInst to DboPlacedInst
        set lPlacedInst [DboPartInstToDboPlacedInst $lInst]


         if {$lPlacedInst != $lNullObj} {
         #placeholder: do your processing on $lPlacedInst
         iterateProps $lPlacedInst
         $lPlacedInst GetReferenceDesignator $name
         lappend refDesList [DboTclHelper_sGetConstCharPtr $name]
        }
    #get the next part inst
    set lInst [$lPartInstsIter NextPartInst $lStatus]
    }
    delete_DboPagePartInstsIter $lPartInstsIter

    #sort list
    set refDesList [lsort $refDesList]
    return $refDesList
}