WebGUI::Asset->getHelpers entries specifiying a url field were breaking the Tree view when selected from the drop down.
WebGUI.Admin.prototype.getHelperHandler was using gotoAsset(), which calls tree.goto(), which mangles the URL into being a request for
the data needed to draw the Tree view of that asset, or tries to.  that works fine when navigating to an asset, but foo?func=edit is
not an asset, and the mangled URL is garbled.  all of the urls (okay, the one attached to the 'edit' and 'view' entries) aren't
trying to direct the admin to an asset but instead are trying to direct it to an admin screen, which, again, cannot be shown in the
data table in Tree view.  so edit and view were fixed by changing that to instead do a showView(), which flops over to the View mode
and then loads the URL without trying to mangle it.
at this point, nothing is blowing up in Doug's JS admin when testing the asset helper menu items in View or Tree mode, though
there are still some problems.