Callback for pcell

Hi guys,

I build a pcell include a name option(name1 and name2) ,and if choose name1,the w=2u and l=2u;choose name2 the w=3u and l=3u.

The default name for this pcell is name1,w=2u,l=2u.

Now,I use dbCreateParamInstByMasterName to call them,like this:

instId=dbCreateParamInstByMasterName(cellId libName pcell "layout"..

list(

     list("name" "sring" "name2")

)

But I found the w/l don't change with the name option changed,which is still w=2u,l=2u.

Then,I use

cdf=cdfGetInstCdf(instId);

param=cdfFindParamByName(cdf "name")

namecallback=param~>callback

 evalstring(namecallback).

But it shows:error.PasCdfCommitValue:faild to find valid initialization data!

And I use isCallable(namecallback),it shows nil.

Thanks~