I don't mean to nitpick but the naming is a bit inconsistent here.  How about we rename `toolTipElement` to `toolTipContent`, `tipContainer` to `toolTipContainer`?  As they are semi-related probably should group your declarations together, in any case our style typically dictates declaring our `var`s at the top of the function.

```
var toolTipContent = graph.$tooltip.find('.elroi-tooltip-content'),
    tipContainer = toolTipElement.find('.elroi-tooltip-container');

toolTipElement.html(tipContent);
```