How to hide a factbox part in a listpage using code? How do you do it?

I can get that to work for a regular form but not for a listpage. The problem I have is that I can only run the code through the listpage interaction class. I can't figure out how to instantiate the PartsList class there:::

partList = new PartList(element);

what to use at the place of element in above line?? or if there is any other way to access Formrun object .