Ext.ux.IFrame?

Hi all;

I am searching for an iframe for ext JS. and stumbled across this http://ift.tt/1FgAPKY

thing is, it seems that this class is not a part of the sencha lib. its only defined in the examples and in the aria theme.

am I missing something? how should I use this class?

also, is there no support for sandbox and srcdoc?

thanks,.

Ext.ux.IFrame?