Determine index number of like name checkbox fields using Javascript

Thanks to all for the replies to my original post. In reality, no sooner had I posted my question and upon further deliberation came to the same conclusion as posted by Thom Parker in his last reply. What I failed to mention in my initial post is that all like name check boxes have different export values. Unfortunately, the reason behind my initial post was that I wanted to change the userName (tooltip) of each like name checkbox on the fly (three in a row) whenever a user ticked/unticked a checkbox. What I momentarily forgot is that whether a like name checkbox is checked/unchecked, all like name check boxes inherit the same as opposed to retaining different userNames which is what I wanted. While I can get everything to work as intended using checkboxes with different names and implementing the correct scripts whereby only one selection out of three is required each with a different userName (tooltip), I was hoping to be able to accomplish the same task using identical name checkboxes which is not going to happen. The advantage in using like as opposed to all different name checkboxes given 50 rows and three columns of checkboxes is that it would significantly reduce the number of scripts required to achieve the desired result.

GetArray only returns different field objects within a named group. It doesn't return widgets.  In fact, there is no good way to know on which widget an event occurs because event.target is the field object, not the widget object returned when getting a field with the widget number.  Radio buttons are special in this respect because there  is a value associated with the specific widget. So the value can be used to determine the widget number through the exportValues list. This is also true for radio-checkboxes when they are checked on.  But isn't true for any other field type.    

For example, try to write a script that sets the fill color for a button widget when it is pushed.  This script should be generic and work when copies are made of the button with no scripting change.  And don't use the location cheat. i.e., using mouseX and mouseY to find the widget rect.