Retreaving Custom filter value

Hi,
I am using DataTable 1,9 and I have a requirement like this:

In my application I am using a custom filter buttons "Started, Processing,Finished". Here I am filtering a particular column "STATUS"
If user select button "Finished",I am using oTable.fnFilter("Finished", mycolumnIndex, false, false);
Now I am saving the entire table using "bStateSave": true"

Here is my requirement: After saving saving that instance if i open again, it should disply same records and settings.
But I am not able to save the user filter button.Is there any way to give solution?
One option is i can check the column "STATUS".If the column have only "Finished", can make sure that user clicked that button.
But I dont know how I can call content of hidden column's value(While saving it is having filtered result).