Cannot Validate current page if form authentication technique using

I can not validate current page if form authentication technique using.
When I click [Xhtml validation] icon at page bottom validate current 
page. Validator return this result:

Result: Passed validation
Address : 
http://pr-trungthu/PKB/Views/LoginView.aspx?ReturnUrl=%2FPKB%2FViews%2FCreateSpace.aspx


So it is validating loginView.aspx not current page CreateSpace.aspx.
How can I use authentication and xhtml validate together.

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_______________________________________________
	*Lê Trung Thu*
        "So^'ng làm vie^.c theo hie^'n pháp và pháp lua^.t"
..Net Development Department

*Pyramid Consulting Vietnam*
Addr :   3rd floor, eTown building, 364 Cong Hoa.
Email:   thu.le@pyramid-consulting.com 
<mailto:thu.le@pyramid-consulting.com>