If I understand the question what happens is that you receive a mousedown event 
with the modifier key set in the event. It is then up to you how to process a 
modifier-click. Vertical selection is something, I think, you have to do for 
yourself.

Perhaps there's some sample code at Apple's site.

On Dec 23, 2009, at 4:58 PM, Dave DeLong wrote:

> In many apps, you can hold down the option key to change the cursor into a 
> crosshair, and do a vertical selection.  In addition, in apps like Pages, you 
> can hold down the command key to do a non-contiguous selection.  I'd imagine 
> that both of these scenarios might result in that method getting invoked.
> 
> Dave
> 
> On Dec 23, 2009, at 2:53 PM, Iceberg-Dev wrote:
> 
>> What kind of event can trigger a non-linear selection to be replaced by 
>> multiple strings in different ranges?
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