I need to force a TextField as Invalid but without using a validator.
How can I do it with ExtJS 2.x (or 3.x) ?

I try to explain why I need it.

I'm creating a J2EE login form so the submit MUST be a standard submit (not a JSON results). So I need now to manage the Error Login Page.

I want to do mark as invalid User Id and Password field using standard ExtJS layout.
Of couse I can add a simple panel with a generic error message... But if I can use standard msgTarget i will be more happy