public SPpage()
{
InitializeComponent();
VendorPage vp = new VendorPage();
vendorframe.NavigationService.Navigate(vp);
CustomerTab cl = new CustomerTab();
customerFrame.NavigationService.Navigate(cl);
StockPage sp = new StockPage();
frameStock.NavigationService.Navigate(sp);
ExpenseAccountPage eap = new ExpenseAccountPage();
ExpenseFrame.NavigationService.Navigate(eap);
ChartPage cp = new ChartPage();
chartFrame.NavigationService.Navigate(cp);
}
private void btn_Back_Click(object sender, RoutedEventArgs e)
{
ExpenseAccountPage eap = new ExpenseAccountPage();
this.NavigationService.Navigate(eap);
}