Master detail page Navigation

Hi,
Am not able navigate to detail page when I click on Same item once again .
private void OnMenuItemSelected(object sender, SelectedItemChangedEventArgs e)
{

        var selectedMenuItem = (Contactss)e.SelectedItem;  
        Type selectedPage = selectedMenuItem.TargetPage;

            Detail = new NavigationPage((Page)Activator.CreateInstance(selectedPage));

            IsPresented = false;


    }  

This code is working only if i click on different items on master page ,For example if i click on item1 it's navigating to item1 page, but if i click on item1 once again it's not navigating to item1 page,