public MainViewModel(Action onClose, IWindowFactory windowFactory, IPageFactory pageFactory) : base(onClose)
{
// Deletes existing database and seeds it with predefined data
DataSeeder dataSeeder = new DataSeeder();
dataSeeder.SeedAll();
// Window services.
_windowFactory = windowFactory;
_pageFactory = pageFactory;
// Setup quotation page view
QuotationPage = _pageFactory.GetNewPageInstanceAsObject(PageType.QuotationPageView);
_quotationPageService = _pageFactory.GetPageService(QuotationPage);
// Setup customer page view
CustomerPage = _pageFactory.GetNewPageInstanceAsObject(PageType.CustomerPageView);
_customerPageService = _pageFactory.GetPageService(CustomerPage);
// Setup item page view
ItemPage = _pageFactory.GetNewPageInstanceAsObject(PageType.ItemPageView);
_itemsPageService = _pageFactory.GetPageService(ItemPage);
// Setup template page view
TemplatePage = _pageFactory.GetNewPageInstanceAsObject(PageType.TemplatePageView);
_templatePageService = _pageFactory.GetPageService(TemplatePage);
SelectedTabIndex = 0;
}