title: what could be the best way to show error message in Extjs?
body: <p>I am using store.synch() method for post data.
  And validation done from server side, currently I am using message box for show error message.
  now I want to something different way to show error,but not markInvalid() because for this I have to change every js fiels and api also.
  so there is any alternative of markInvalid()?</p>