Using part of script in unity default scripts

I'm trying to make an independence that would let me affect with other game object (and whatever component in that) As i know the UI component Button have a very neat Onclick that let you affect with other game object (and whatever component in that) ,so i wonder whether i can make use of that.,whether it is inherit,interface or just simply plain script text that would do the same ![alt text][1] [1]: /storage/temp/93181-question.png Yeah,i would love to have that red part in my independence script,thank in advance