zend how to validate 3 separate form in same action?

[Tidal]

So, I have 3 forms on the same page and same controller action, when I click on one of the submit button, it validates all forms instead of the one I clicked.how can I separate it from validation??here my code:\[code\]public function signUpAction(){ $firstName = $this->getRequest()->getParam('firstName'); $lastName = $this->getRequest()->getParam('lastName'); $email = $this->getRequest()->getParam('email'); $emailAdrress = $this->getRequest()->getParam('Email_Address'); $password = $this->getRequest()->getParam('password'); $signupForm = new Application_Form_UserSignUp(); $loginForm = new Application_Form_UserLogin(); $retreivePasswordForm = new Application_Form_UserRetreivePassword(); if ($this->getRequest()->isPost('signupForm')) { /*********** Sign Up Form ***********/ if ($signupForm->isValid($this->getRequest()->getParams())) { $user = $this->_helper->model('Users')->createRow($signupForm->getValues()); if ($user->save()) { Zend_Session::rememberMe(186400 * 14); Zend_Auth::getInstance()->getStorage()->write($user); $user->sendSignUpEmail(); $this->getHelper('redirector')->gotoRoute(array(), 'invite'); return; } else { } } else { // something } } if ($this->getRequest()->isPost('loginForm')) { /************ Login Form ************/ if ($loginForm->isValid($this->getRequest()->getParams())) { $user = $this->_helper->model('Users')->createRow($loginForm->getValues()); $user = $this->_helper->model('Users')->fetchRowByFields(array('email' => $email, 'hash' => $password)); if($user) { Zend_Session::rememberMe(86400 * 14); Zend_Auth::getInstance()->getStorage()->write($user); $this->getHelper('redirector')->gotoRoute(array(), 'invite'); return; } else { // Error message $this->view->errorMsg = "<b>password</b> - invalid, please try again! *"; } } else { // something } } if ($this->getRequest()->isPost('retreivePasswordForm')) { /****** Retreive Password Form ******/ if ($retreivePasswordForm->isValid($this->getRequest()->getParams())) { $user = $this->_helper->model('Users')->createRow($retreivePasswordForm->getValues()); $user = $this->_helper->model('Users')->fetchRowByFields(array('email' => $emailAdrress)); if($user) { Zend_Auth::getInstance()->getStorage()->write($user); $user->sendRetreiveEmail(); $_SESSION['email'] = $emailAdrress; $redirector = $this->_helper->getHelper('redirector'); $redirector->setCode(301)->setUseAbsoluteUri(); $newPath = 'http://refer.lavasoft.com/#retreive_sent'; $redirector->gotoUrl($newPath); //$this->view->assign('sendEmail', $emailAddress); } else { } } else { // something } } $this->view->retreivePasswordForm = $retreivePasswordForm; $this->view->loginForm = $loginForm; $this->view->signupForm = $signupForm;}\[/code\]