must use polymer api to add charts to environment. Js dom api does not properly initialize elements

for example

if the page contains

<epiviz-environment id="env">
</epiviz-environment>

to add an epiviz chart for example line-track.

create a new element

elem = document.createElement('epiviz-line-track'); 
elem.dimS = ['affy1', 'affy2']; 
elem.dimX = 'affy1'; 
elem.dimY = 'affy2'; 
elem.className="charts"

query dom for environment

ot = document.querySelector('#env')

add chart

Polymer.dom(ot).appendChild(elem)