How to get the value of change state check box during Approve state, when the uuser presses OK, Do Transition?

Hi,

Im trying to automate EPDM API workflow, during "Do Transition", the users will see a dialog box with list of files, and reference to the assembly. He can check/select or unselect/uncheck any file/sub assembly or component. So, I need to know what are the checked files and unchecked files

Thanks

Mohamad