How to get VIAS name for a particular technology ?

Hello,

To get all the VIAS name for a technology , I am using this :

techID~>viaDefs~>name

The above statement is giving me all the VIAS form the technolog y, but  I want only the vias which can be used in layout.

Ex: when you call the function "leHiCreateVia()" in layout window,a GUI opens.In that GUI list of VIAS are there , which user can select and put in the layout .

So through skill , how can I get those vias name.

OR from list (techID~>viaDefs~>name) , how can I filter the original VIAS.

Please suggest me,

Thanks in advance,

Amar