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According to HighChart API and HighStock API:

renderTo: String|Object
The HTML element where the chart will be rendered. 
If it is a string, the element by that id is used. 
The HTML element can also be passed by direct reference. Defaults to null.

First, Highchart requires passing "id" of div element. So, I doubt how passing class name works with first example you have mentioned.

Can you please share from where did you get the former HighChart example ?

Second, Do you have a div containing id="graphcontainer" and included Highstock like

<script src=""></script>

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