Check box value assigned by Numeric Field rawValue

This was asked and answered back in 2009 (http://forums.adobe.com/message/5944725#5944725), but I have a twist to the question:

I'm able to get the action to work, but not right away. I had to click around on the form to make the check box tic. I assigned the following code to the JhammerPassed-named check box:

if (JhammerSatTotal.rawValue <=80){
  JhammerPassed.rawValue =1;

} else {

  JhammerPassed.rawValue =0;

}

Essentially I have two boxes: one if they passed and one if they failed. So, if the value of the points awarded is greater than or equal to 80, then the 'passed' box tics. I added the less than version to the 'failed' box. They only seem to tic if I click on the JhammerSatTotal cell, then away, then back again. Is this just a quirk of the program or is there a way for it to be more responsive?

Thanks!

~Laura