How to set mouse position only inside the same thing

hi am a newbie to Gamesalad now am create game like jewel matching or game like to drag the same color gems that close to another same color gems.I learn from http://gshelper.com/?p=1773 this tutorial that only have white color

now i can set colour difference but dont know how to drag only gems that have same color as first gems that i start press
and don't know how to random new actor add in because now it is add with the selected actor that deleted
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