Construct the UI for this widget from a template, setting this.domNode.
Lookup cached version of template, and download to cache if it
isn't there already. Returns either a DomNode or a string, depending on
whether or not the template contains ${foo} replacement parameters.
open insert dialog (creates and initalizes the dialog content)
parameters
evt passed event object
highlightArea alias of navbar group e.g. Default (scroll to that area)
selectElement alias of element e.g. Default