How do i Change the number of rows & columns of a customVia in IC6.1.6

Hi all,

I am using IC6.1.6.

I am writing a code to increase & decrease the number of rows & columns of a customVia

Can someone please help me with the code.

I am able to access the number of rows & columns by using the dbid :  css()~>viaHeader~>overrideParams

1. How can I force the value of rows & columns to change to a specific number.

2. How can i change the number of rows & columns of a via by using the arrow keys up.down,right,left buttons.

                                 if i press up bindkey twice the rows should increase by 2(Similarly for the down button rows should decrease)

                                 if i press right bindkey twice the rows should increase by 2(Similarly for the left button columns should decrease)

Thanks ,

Girish