I agree Colin. Users expect a radio button to be exactly one and only one of 2 
or more choices. Checkboxes are expected to be none to any of one or more 
choices. 

Bob


On Jan 17, 2011, at 11:58 AM, Colin Holgate wrote:

> 
> On Jan 17, 2011, at 2:49 PM, Peter Haworth wrote:
> 
>>> How can a user clear the highlight of  a radio button?  Clicking on it when 
>>> it's not set highlights it but clicking it when it's highlighted has no 
>>> effect.
> 
> 
> If it could do that, it would be a checkbox. You could set the autohilite of 
> a single radio button to be false, and then have a script like this:
> 
> on mouseUp
>   set the hilite of me to not the hilite of me
> end mouseUp
> 
> 
> 
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