X-Cart forums - adding my page in Admin

I tried to add a webpage in Admin to update some customized features in my cart. I had a mypage.php in cart\admin directory, and put mypage.tpl in cart\skin1\admin\main directory. The mypage.php looks like:

Code:

require "./auth.php";

require $xcart_dir."/include/security.php";



...

php codes related to database actions

...



$smarty->assign("main","mypage");



$smarty->assign("location", $location);



# Assign the section navigation data

$smarty->assign("dialog_tools_data", $dialog_tools_data);



@include $xcart_dir."/modules/gold_display.php";

func_display("admin/home.tpl",$smarty);

But, When I run www.mydomain/cart/admin/mypage.php after logged in as master, I get error saying

Page not found!
The requested page does not exist or you are not allowed to access it!

Did I miss something? Do I need to register mypage.tpl in somewhere?

Thanks a lot for your help.

Jeff

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Version 4.0.14