Draw line between circle and make it moveable (short code)

Draw line between circle and make it moveable (short code)
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#1

pen: [ https://codepen.io/ustvarno/pen/mEjBXo?editors=0010 ]
i’m nearly end to complete my portfolio but
u’ll see work version of circles appended in line 470, that works
but when u delete that and uncomment line 469, ( on that line is my groups with [circle and text] that i appended earlier ), it doesn’t work, why?

code from here: [ http://stackoverflow.com/a/24313834 ]