User selecting multiple UIButtons with touch and drag

I am wondering if it's possible to have a user touch and drag across multiple buttons so that I can tell which buttons have been selected.
This is similar to to a matrix of buttons in OS X. If a user clicks and drags over a number of buttons, there is an array that can be read to see which were 'selected'. I don't see a UIMatrix and Embed Objects In menu in Interface Builder while in iPhone development only gives a View selection.
Thanks!

It seems this is being done by others. However, right now, I'm tracking the touch location and manually figuring out which button is under the drag. I let the underlying view be the user interaction and turn off the interaction on the UIButtons themselves. Yet, this seems to task the processor quite a bit and it takes too long to highlight the UIButtons.
It's such a simple thing for OS X, I can' believe they dropped this functionality on the iPhone. Can anyone please give some hints as to something to try here.
Thanks.

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User selecting multiple UIButtons with touch and drag

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