you have to check the checkboc list by using a for loop.
what i mean is: you have to check single check boxes in the list and if one is checked then you can return true and if the loop is completed without executing that return statement it means nothing is checked.so you have return false outside the for loop.
In your code you are checking whether all the checkboxes are checked or not.So,it will satisfy your condition only when all the checkboxes are checked.
Your code should be like this:
rate the answer if it is useful...