* @cfg {String} title of popover (or false to hide)
* @cfg {String|function} (right|top|bottom|left|auto) placement how it is placed
* @cfg {String} trigger click || hover (or false to trigger manually)
+ * @cfg {Boolean} modal - popovers that are modal will mask the screen, and must be closed with another event.
* @cfg {String|Boolean|Roo.Element} add click hander to trigger show over what element
* - if false and it has a 'parent' then it will be automatically added to that element
* - if string - Roo.get will be called