Prado\Web\UI\WebControls\TWizard::bubbleEvent PHP Method

    public function bubbleEvent($sender, $param)
    {
        if ($param instanceof \Prado\Web\UI\TCommandEventParameter) {
            $command = $param->getCommandName();
            if (strcasecmp($command, self::CMD_CANCEL) === 0) {
                $this->onCancelButtonClick($param);
                return true;
            }
            $type = $this->getStepType($this->getActiveStep());
            $index = $this->getActiveStepIndex();
            $navParam = new TWizardNavigationEventParameter($index);
            if ($sender instanceof \Prado\Web\UI\IButtonControl && $sender->getCausesValidation() && ($page = $this->getPage()) !== null && !$page->getIsValid()) {
                $navParam->setCancelNavigation(true);
            }
            $handled = false;
            $movePrev = false;
            $this->_activeStepIndexSet = false;
            if (strcasecmp($command, self::CMD_NEXT) === 0) {
                if ($type !== self::ST_START && $type !== self::ST_STEP) {
                    throw new TInvalidDataValueException('wizard_command_invalid', self::CMD_NEXT);
                }
                if ($index < $this->getWizardSteps()->getCount() - 1) {
                    $navParam->setNextStepIndex($index + 1);
                }
                $this->onNextButtonClick($navParam);
                $handled = true;
            } else {
                if (strcasecmp($command, self::CMD_PREVIOUS) === 0) {
                    if ($type !== self::ST_FINISH && $type !== self::ST_STEP) {
                        throw new TInvalidDataValueException('wizard_command_invalid', self::CMD_PREVIOUS);
                    }
                    $movePrev = true;
                    if (($prevIndex = $this->getPreviousStepIndex(false)) >= 0) {
                        $navParam->setNextStepIndex($prevIndex);
                    }
                    $this->onPreviousButtonClick($navParam);
                    $handled = true;
                } else {
                    if (strcasecmp($command, self::CMD_COMPLETE) === 0) {
                        if ($type !== self::ST_FINISH) {
                            throw new TInvalidDataValueException('wizard_command_invalid', self::CMD_COMPLETE);
                        }
                        if ($index < $this->getWizardSteps()->getCount() - 1) {
                            $navParam->setNextStepIndex($index + 1);
                        }
                        $this->onCompleteButtonClick($navParam);
                        $handled = true;
                    } else {
                        if (strcasecmp($command, self::CMD_MOVETO) === 0) {
                            if ($this->_cancelNavigation) {
                                // may be set in onSideBarButtonClick
                                $navParam->setCancelNavigation(true);
                            }
                            $requestedStep = $param->getCommandParameter();
                            if (!is_numeric($requestedStep)) {
                                $requestedIndex = -1;
                                foreach ($this->getWizardSteps() as $index => $step) {
                                    if ($step->getId() === $requestedStep) {
                                        $requestedIndex = $index;
                                        break;
                                    }
                                }
                                if ($requestedIndex < 0) {
                                    throw new TConfigurationException('wizard_step_invalid');
                                }
                            } else {
                                $requestedIndex = TPropertyValue::ensureInteger($requestedStep);
                            }
                            $navParam->setNextStepIndex($requestedIndex);
                            $handled = true;
                        }
                    }
                }
            }
            if ($handled) {
                if (!$navParam->getCancelNavigation()) {
                    $nextStepIndex = $navParam->getNextStepIndex();
                    if (!$this->_activeStepIndexSet && $this->allowNavigationToStep($nextStepIndex)) {
                        if ($movePrev) {
                            $this->getPreviousStepIndex(true);
                        }
                        // pop out the previous move from history
                        $this->setActiveStepIndex($nextStepIndex);
                    }
                } else {
                    $this->setActiveStepIndex($index);
                }
                return true;
            }
        }
        return false;
    }