You actually have two separate problems, one preventing the load handler from working and the other preventing the tap handler from working.
The events aren't being triggered because you're trying to modify DOM node attributes when the DOM node for the Enyo component hasn't been created yet. DOM nodes are created when the component is rendered. Move your sourceChanged() function to the control's rendered() function or if you need it in the control's create() function, call hasNode() on the control to force it to create the DOM node first.
Try this version of your sourceChanged() function and see if it works.
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