Label Position "Collapsed" is not working for Checkbox field

Hi All,

My requirement is add a mandatory check to checkbox field and it should look something like this below.

* [] Too expensive

In order to achieve this, I can use Label position for checkbox as "COLLAPSED".

But When I used "COLLAPSED", its not working for me as I m using a values as a local variable which is declared inside with function.

But I want these  local variables to be declared inside with function as I need to refresh these on certain conditions.

So can anybody please suggest me how can I achieve this?

Thanks In Advance

Beena