Using MVC the button controls click event is not working

I build a web site with MVC4, and in my routeConfig file I have this procedure:

Public Sub RegisterRoutes(ByVal routes As RouteCollection)
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}")
    routes.IgnoreRoute("{resource}.aspx/{*pathInfo}")
    routes.IgnoreRoute("{resource}.aspx")
    default.aspx will load instead
    routes.MapRoute(
        name:="Default",
        url:="{controller}/{action}/{id}",
        defaults:=New With {.controler = "Home", .action = "Index", .id = UrlParameter.Optional}
    )
End Sub

In my HomeControler I have this function:

Function Index() As ActionResult
    Return View("Default")
End Function

Thus my Default.aspx is working just fine. But.
When I'm trying to click a button cannot Handle the onclick event (never goes to the sub.
So I use a OnClientClick in aspx to raise up this event.
But throws me the error of:

grFlagsBtn_Click' is undefined

And one more issue... I've noticed the program remains on Home/Index environment. Where there is no any Index file at this area.
But the Url in my browser says href="http://localhost:49224/Home/Index"
I found that very much strange, because the program should be in /Home/Default.. I think, I'm not of that.
Please is some one to give me some help on this?