* Puts a mask over this element to disable user interaction. Requires core.css.
* This method can only be applied to elements which accept child nodes.
* @param {String} msg (optional) A message to display in the mask
- * @param {String} msgCls (optional) A css class to apply to the msg element
+ * @param {String} msgCls (optional) A css class to apply to the msg element - use no-spinner to hide the spinner on bootstrap
* @return {Element} The mask element
*/
mask : function(msg, msgCls)