function _getShortcutHintText(sDOMRefID) {
		var aHints = oHintRegistry.mDOMNodes[sDOMRefID];

		if (!aHints || !aHints.length) {
			return;
		}

		return aHints.map(function(oHint) {
			return oHint._getShortcutText();
		}).join(", ");
	}
Gets the shortcut hint text for a registered DOM node.

@param {string} sDOMRefID A registered DOM node ID