When i am Clear Button , it's going to Exceptions Because in the collection_wrapper and entity is intial. before the collection wrapper i call the custome controller. aftert that entity is i call the method is switch_to_change( ). this method is throw as excepetion.
for Exmaple :
F1 : Null
like that view is there .
now i want clear field it's going to exceptions.........
thanks in advanced