How-to create auto-updating fields

Hello, I'm having a slight problem with user controlled fields on the front panel. I'm using controls in LabVIEW 8.0, and my problem is that when a user enters a new value into a numeric control field, the control does not update and pass that value throughout the rest of the code unless the user presses the <enter> key while the field is still selected. Seems as though there should be an easy fix.
Thanks in advance.

Well to specify, what I'm trying to do is create a program for students to use in and education lab, just for simplicity it would be preferred that they not have to press enter at the end of every string of numbers written into a field. The controls that I'm using are governing for loop parameters; the for loop activates with a mouse down event structure. The problem is that if a student enters that they'd like the loop to perform say 500 iterations one time, and they wish for 300 the next; if they don't press enter after changing the value of the numeric control on the front panel the loop will perform 500 iterations again. I have tried using various types of event structures on the numeric control such as "key up" and "key down" however the same problem arises that they enter key must be pressed in order for the value to update.
I've tried this both on the experiment VI, and a new blank VI with various control-to-indicator set-ups.

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