CWizardBase::AddStep

function AddStep($obStep, $stepID = null)
{
	if (!is_subclass_of($obStep, "CWizardStep"))
	{
		$this->__ShowError("Your class ".get_class($obStep)." is not a subclass of CWizardStep
");
		return;
	}

	$obStep->_SetWizard($this);
	$obStep->InitStep();
	$ownStepID = $obStep->GetStepID();

	if ($ownStepID == null && $stepID == null)
	{
		$this->__ShowError("Your step (class ".get_class($obStep).") has no ID
");
		return;
	}

	$stepID = ($stepID !== null ? $stepID : $ownStepID);
	$obStep->SetStepID($stepID);
	$this->wizardSteps[$stepID] = $obStep;

	if ($this->firstStepID === null)
		$this->SetFirstStep($stepID);
}