d3.js - Passing (this) between functions -

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i'm trying extend 1 rectangle using drag handle without altering other rectangles. i've tried pass on selected 1 using (this) can't work. http://jsfiddle.net/sjp700/gmlay/ -drag right hand black bar. issue or alternatives? 

var dragright = d3.behavior.drag()      .origin(function() {          var t = d3.select(this);


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