Grid Iframe problem V2.0 B4

I am trying to get a grid working within an IFrame. When it loads, I get a javascript error:

Error: this.getHeaderTemplate(ii).element() has no properties
Source File: http://localhost:8888/test/widgets/ActiveWidgets/aw.js
Line: 75

When I run my html file outside the IFrame it works fine. I am not accessing the grid outside of the iframe in any way.

Any thoughts?

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