Click and drag to another button
<p>There is an app call DurionLite (free on iPhone) which plays a word game where letters are clicked and dragged into word construction slots to create words.  As the dragged letter gets near the construction slots, the borders of the nearest construction slot is highlighted and if you then release the letter, it goes into the highlighted construction slot.  You can also then click and drag letters from the construction slots (although not back to their original locations).  I'm trying to do a similar thing but can't figure out how that can be done.  Can anyone enlighten me?</p>
