/// <summary>
/// Attempts to go to the previous step in the wizard.
/// </summary>
/// <exception cref="WizardStepException">If the wizard is on the first step this exception will be thrown.</exception>
public void Previous()
{
var previousStep = _wizardController.GetPreviousStep();
_wizardController.UndoCompleteCurrentStep();
SetStep(previousStep);
NextButton.Text = "Next";
SetButtonState();
}
