private void ExecutePreviousPageCommand()
{
IWizardPageVM previousPage = null;
var currentIndex = WizardPages.IndexOf(CurrentPage);
var previousPageIndex = currentIndex - 1;
if (previousPageIndex >= 0 && previousPageIndex < WizardPages.Count)
{
previousPage = WizardPages[previousPageIndex];
}
CurrentPage = previousPage;
UpdatePageCommand();
}